Every community has its own rules
Reddit is thousands of communities, each run by volunteer moderators who write and enforce their own rules. Many limit self-promotion, and many ban AI-generated images or text outright. Before a brand posts anywhere, someone should read the rules, check whether brand accounts are welcome, and look at what the community rewards: usually expertise, candour and humour, rarely polish. Moderators remove posts that break the rules and can ban accounts, and a removal with a public explanation is worse than not posting. AI helps with the homework, such as summarising a community's rules and recurring questions, but the decision to take part should be a person's.
Ads that read like good posts
Promoted posts appear in feeds and on conversation pages looking much like ordinary posts, with headlines of up to 300 characters. Targeting can follow communities, interests and keywords, with ads shown in feeds and in conversations, which means an ad can be written for the people it will actually reach. A gaming community and a personal finance community need different ads, not one ad with a different thumbnail. The ads that fit read like a useful post in that community: specific, plain, and open about being an ad. Generation makes community-specific variants affordable. Keep the imagery honest, because glossy synthetic scenes read as out of place in feeds full of phone photos.
Comments are part of the ad
Advertisers can switch comments on or off. With comments on, the thread becomes part of the ad, and someone will ask whether the image is AI, what it costs or why the last version broke. Answer quickly and honestly from a clearly labelled brand account. Never use generated accounts, posts or comments that pose as ordinary users. Reddit's rules prohibit content manipulation, and where the posts praise a product they are fake reviews: banned in the UK by the Digital Markets, Competition and Consumers Act 2024 from April 2025, and in the US by the FTC's 2024 rule on fake reviews and testimonials.
Transparency as the strategy
The brands that do well on Reddit tend to show up as themselves: a named team, a flair that says who they work for, answers that admit limits. The same applies to generated material. If a concept image, a product visualisation or a translated video was made with AI, saying so costs little, and being found out costs a great deal in a community that remembers. Synthetic White keeps a per-asset record of which model made what, so a community manager asked whether something was made with AI can answer accurately in the thread instead of guessing or going quiet.
Updated 25 September 2026