Thanks, Mark, and good afternoon, everyone. Let's begin with our consolidated results. All comparisons are on a year-over-year basis unless otherwise noted. Q3 total revenue was $34.1 billion, up 23% or 21% on a constant currency basis. Q3 total expenses were $20.4 billion, down 7% compared to last year. In terms of the specific line items, cost of revenue increased 9%, as higher infrastructure-related costs were partially offset by lower content costs. R&D increased 1%, as higher headcount-related costs from Family of Apps and Reality Labs were partially offset by lower non-headcount related Reality Labs operating expenses. Marketing & Sales decreased 24%, due primarily to lower marketing spend and headcount-related costs. G&A decreased 39%, due primarily to lower legal-related expenses.
We ended the quarter with over 66,100 employees, down 7% from the second quarter. Our third quarter headcount no longer included the substantial majority of the employees impacted by the previously announced layoffs. Third quarter operating income was $13.7 billion, representing a 40% operating margin. Our tax rate for the quarter was 17%.
Net income was $11.6 billion or $4.39 per share. Capital expenditures, including principal payments on finance leases, were $6.8 billion, driven by investments in servers, data centers and network infrastructure. Capital expenditures were below the prior year levels primarily due to lower server and data center construction spend as we prepared to shift to our new data center design, as well as payment timing. Free cash flow was $13.6 billion, benefitting from a deferral of income taxes which was paid in the fourth quarter. We repurchased $3.7 billion of our Class A common stock in the third quarter and ended the quarter with $61.1 billion in cash and marketable securities and $18.4 billion in debt.
Moving now to our segment results. I'll begin with our Family of Apps segment. Our community across the Family of Apps continues to grow. We estimate that approximately 3.14 billion people used at least one of our Family of Apps on a daily basis in September, and that approximately 3.96 billion people used at least one on a monthly basis. Facebook continues to grow globally and engagement remains strong. Facebook daily active users were 2.09 billion, up 5% or 101 million compared to last year. DAUs represented approximately 68% of the 3.05 billion monthly active users in September. MAUs grew by 91 million or 3% compared to last year.
Q3 Total Family of Apps revenue was $33.9 billion, up 24% year-over-year. Q3 Family of Apps ad revenue was $33.6 billion, up 24% or 21% on a constant currency basis. Within ad revenue, the online commerce vertical was the largest contributor to year-over-year growth, followed by CPG and gaming. Online commerce and gaming benefited from strong spend among advertisers in China reaching customers in other markets. On a user geography basis, ad revenue growth was strongest in Rest of World and Europe at 36% and 35%, respectively, followed by Asia Pacific at 19% and North America at 17%. Foreign currency was a tailwind to advertising revenue growth in all international regions. In Q3, the total number of ad impressions served across our services increased 31% and the average price per ad decreased 6%. Impression growth was mainly driven by Asia-Pacific and Rest of World. The year-over-year decline in pricing was driven by strong impression growth, especially from lower monetizing surfaces and regions. While overall pricing remains under pressure from these factors, we believe our ongoing improvements to ad targeting and measurement are continuing to drive improved results for advertisers.
Family of Apps other revenue was $293 million in Q3, up 53%, driven by strong business messaging revenue growth from our WhatsApp Business Platform. We continue to direct the majority of our investments toward the development and operation of our Family of Apps. In Q3, Family of Apps expenses were $16.4 billion, representing approximately 81% of our overall expenses. FoA expenses were down 9% as growth in infrastructure-related costs was more than offset by lower legal-related expenses, marketing, and headcount-related costs. Family of Apps operating income was $17.5 billion, representing a 52% operating margin. Within our Reality Labs segment, Q3 revenue was $210 million, down 26% due primarily to lower Quest 2 sales. Reality Labs expenses were $4.0 billion, flat year-over-year as higher headcount-related expenses were offset by lower non-headcount related operating expenses. Reality Labs operating loss was $3.7 billion. Turning now to the business outlook.
There are two primary factors that drive our revenue performance. Our ability to deliver engaging experiences for our community, and our effectiveness at monetizing that engagement over time. On the first, overall engagement on Facebook and Instagram remains strong. Reels, and video content more broadly, continues to grow and drive incremental engagement. AI- recommended content from unconnected accounts in Feed continues to become increasingly incremental to engagement, including in the US & Canada.
These gains are being driven by improvements to our recommendation systems and we see additional opportunities to advance our systems even further in the future as we deploy more advanced models. We're also developing entirely new experiences for our community. Our investments in AI capacity in recent years have enabled us to support leading Generative AI research and we're meaningfully accelerating the pace of bringing that research into our products. We launched our first consumer Gen AI experiences last month that are built on top of our foundation models and are excited to learn from how people use these tools to make them increasingly valuable over time. Aside from Generative AI, Threads also remains a compelling long-term opportunity and we're excited to build on the strong product momentum we have going into next year.
Turning to the second driver, improving monetization. Here, our focus is on continuing to drive marketing performance for businesses, including through business messaging. There are four areas of this work, improving Reels monetization; creating engaging on-platform ad experiences; making it easier for advertisers to connect their marketing data, and increasingly leveraging AI across our ads systems and products.
On Reels, we have continued to improve monetization and are now at a level where Reels is neutral to overall revenue. We've made tremendous progress over the last year building and scaling Reels as a consumer product, and it has now become part of the core experience on Instagram and Facebook. As such, we don't anticipate quantifying the net revenue contribution from Reels going forward. We will still work to further improve Reels ads performance through ranking improvements and making Reels ads increasingly interactive, while also growing supply to give businesses more opportunities to get in front of people. We anticipate this ongoing work will help Reels be a modest tailwind to revenue in 2024 while we continue to strike the right balance between engagement and revenue growth. But our focus going forward will be on growing revenue and engagement on overall video, and more holistically across our product lines within Instagram and Facebook. Next, onsite experiences. We're seeing sustained momentum with Click-to-Message ads.
Click-to-WhatsApp ad revenue continues to grow very quickly in particular and is already at a multi-billion dollar annual run-rate. We're progressing on our work to enable further down the funnel conversions, and longer-term, we're excited about the potential of AI to help businesses message with customers more efficiently at scale. We've recently started testing AI capabilities with a few partners and will take our time to get the experience right, but we believe this will be a big unlock for business messaging in the future. We're also excited about the potential for paid messaging, which serves as a nice complement to click-to-messaging ads by helping businesses develop ongoing relationships with customers once they're in a messaging thread. Outside of business messaging, we're seeing good early traction with Shops ads and in the third quarter we announced expanded commerce integrations with third party services to make it easier for businesses to set up a Facebook or Instagram Shop and run Shops ads. The third piece of our work is making it easier for advertisers to connect their marketing data. We're investing in ways to make it easier for advertisers to adopt our Conversions API, understand its impact, and use it across a broader set of objectives. In addition to our existing support for AWS, in September, we announced the support of Google Cloud for the Conversions API Gateway. We've also introduced enhanced reporting and rolled out Conversions API for Business Messaging so click-to-message advertisers can now better understand the value of WhatsApp and Messenger and improve their performance. Last, AI. We are leveraging AI across our ads systems and suite of products, which is driving improved performance for advertisers. We're increasingly adopting the use of larger, more advanced ads models and using AI to power ads products that provide increased automation to advertisers. We're seeing strong traction with our Advantage+ Shopping solution, particularly around online commerce and CPG advertisers looking to drive online sales. And we're continuing to invest in several other products within our Meta Advantage+ suite to help advertisers optimize and automate more of their campaigns.
Before turning to our revenue outlook, I'd like to provide color on our hiring plans as we look to 2024. One important point to note is that we are currently operating with a significant underrun against our 2023 budgeted headcount. For much of late 2022 and early 2023, we had instituted a broad-based hiring freeze as we undertook our restructuring efforts. In addition, as part of those restructuring efforts, many teams elected to make deeper headcount reductions in order to hire different skill sets that they need. We have since resumed hiring but expect that much of our hiring that was originally planned for and budgeted in 2023 will occur in 2024. As part of our 2024 budget, we plan to selectively allocate incremental headcount toward four key company priorities, AI, infrastructure, Reality Labs, and monetization as well as toward our regulatory and compliance needs. Of those areas, we expect AI to be the largest area of increased investment as we further invest in Generative AI across our core products, internal tooling, and research efforts. We aim to offset some of this growth by continuing our efficiency focus and reducing planned hiring in other areas across the company in 2024. The net effect of our efforts to close out our 2023 hiring underruns and our efficiency-focused 2024 budgeting process is that we expect to end next year with reported, in-seat headcount meaningfully higher than our current headcount, but to grow at a slower rate beyond that. We also expect a step-up in infrastructure-related expense growth next year as we recognize higher depreciation and operating costs from running an expanded infrastructure footprint.
In addition, we continue to monitor the active regulatory landscape, including the increasing legal and regulatory headwinds in the EU and the US that could significantly impact our business and our financial results. Of note, the FTC is seeking to substantially modify our existing consent order and impose additional restrictions on our ability to operate. We are contesting this matter, but if we are unsuccessful it would have an adverse impact on our business. Turning now to the revenue outlook.
We expect fourth quarter 2023 total revenue to be in the range of $36.5 billion to $40 billion. Our guidance assumes a foreign currency tailwind of approximately 2% to year-over-year total revenue growth in the fourth quarter, based on current exchange rates. Turning now to the expense outlook. We anticipate that our full-year 2023 total expenses will be in the range of $87 billion to $89 billion, lowered from our prior range of $88 billion to $91 billion.
This outlook includes approximately $3.5 billion of restructuring costs related to facilities consolidation charges and severance and other personnel costs. We expect Reality Labs operating losses to increase year-over-year in 2023. We are also sharing a preliminary outlook for 2024 expenses, CapEx and our tax rate.
We expect full-year 2024 total expenses to be in the range of $94 billion to $99 billion. We continue to expect a few factors to be drivers of total expense growth in 2024. First, we expect higher infrastructure-related costs next year. Given our increased capital investments in recent years, we expect depreciation expenses in 2024 to increase by a larger amount than in 2023. We also expect to incur higher operating costs from running a larger infrastructure footprint. Second, we anticipate growth in payroll expenses as we work down our current hiring underrun and add incremental talent to support priority areas in 2024, which we expect will continue to shift our workforce composition toward higher-cost technical roles. Finally, for Reality Labs, we expect operating losses to increase meaningfully year-over-year due to our ongoing product development efforts in AR/VR and our investments to further scale our ecosystem. Turning now to the capex outlook.
We expect 2023 capital expenditures to be in the range of $27 billion to $29 billion, updated from our prior estimate of $27 billion to $30 billion. We anticipate our full-year 2024 capital expenditures will be in the range of $30 billion to $35 billion, with growth driven by investments in servers, including both non-AI and AI hardware, and in data centers as we ramp up construction on sites with the new data center architecture we announced late last year. On to tax. Absent any changes to US tax law, we expect our fourth quarter 2023 and full-year 2024 tax rates to be similar to the third quarter of 2023. Please note that our outlook for 2024 expenses, capital expenditures and tax rate are preliminary estimates. In the future, we expect to provide our forward — our initial forward year expense, capex and tax rate outlooks on the fourth quarter call.
In closing, this was a good quarter for our business as our efficiency efforts are translating into improved financial results and we're seeing momentum across our company priorities. We're excited to build on this work in 2024 as we invest in areas that have the potential to meaningfully transform how people engage with our services and each other in the years ahead. With that, Dave, let's open up the call for questions.