Why Reddit Is the Ad Platform You Can No Longer Afford to Ignore

Times have changed. Reddit should be a serious platform for any marketer looking to make waves or understand their brand, explains Mark Ritson.

Five years ago, if a CMO had told me she was pushing more of her paid social budget toward Reddit, I’d have asked her to repeat the sentence. Slowly, then billed her for a day of the resulting yelling I’d have to do. After all, Reddit was the place where middle-aged men in basements debated fluoride’s mind-controlling capabilities. The last place any serious brand would consider operating within.

Last week, Reddit reported its Q1 numbers. Revenue of $663m, up 69% year-on-year. Advertising revenue of $625m, up 74%. Daily active uniques of 126.8m, up 17%. The company has now strung together five consecutive quarters of advertising growth above 70%, against a digital ad market that the major holding companies describe as “softening.”

While the marketing world argued about ChatGPT, Unilever’s creator strategy, and tariffs, the most consequential platform shift in advertising has quietly compounded. Reddit is now a $2.6bn-a-year ad business, growing faster than any other meaningful platform in the western world. No one should be laughing any more.

In February, analytics firm Fospha published its State of Retail Commerce 2026 report. The headline finding: when Fospha attributed cross-channel sales properly, Reddit’s ROAS jumped 82%. The platform that everyone was allocating crumbs to turned out to be a hidden engine of huge retail demand. Revenue influenced by Reddit grew 257% year-on-year in 2025. The Times reported that tests of Reddit’s new AI-based “Max” campaign tool showed conversion rates doubling.

Reddit is now the connective tissue of the AI search era. When you ask a chatbot which noise-cancelling headphones are best, the answer is derived from Reddit threads. Reddit signed content licensing deals with Google and OpenAI. Reddit influences purchase decisions on every AI surface.

Why haven’t all CMOs moved?

1. Calcified media planning

Most large advertisers run annual planning cycles where last year’s allocation is the starting point. A platform that wasn’t on the spreadsheet last year doesn’t get on it this year, no matter what the data says.

2. Creative cowardice

Reddit is one of the only ad environments left where the audience can publicly tell you your creative is rubbish. The platform punishes inauthenticity. That should excite brand teams, but most trade impact for control.

3. Consumer snobbery

Reddit’s audience is younger, more male, more technical, and more skeptical. It doesn’t look like the focus-group composite. But it looks like the people who actually buy your product. Reddit is an enormous ongoing transcript of consumers being themselves—rich, granular, category-specific qualitative data, free for anyone willing to read it.

If you are still treating Reddit as a side-of-plate test budget, you are about 18 months behind. The good news is that 18 months is recoverable. The even better news is that everyone reading this will nod sagely and not fix it on Monday, which is why the arbitrage opportunity exists in the first place.