User-generated content (UGC) is content made by customers, fans, or independent creators rather than the brand: unboxing videos, reviews, photos of the product in the wild, testimonial-style clips. In paid social it has become a dominant creative style — DTC brands brief creators to shoot "UGC-style" ads precisely because feeds reward things that feel like a person talking rather than a company advertising. The appeal is credibility: people trust people more than they trust polished brand copy.
The comment section under a paid ad is UGC in its rawest form. Every comment is user-generated content displayed inside your ad unit, at the exact moment a prospect is deciding whether to click. A customer writing "bought two, obsessed" under your ad is doing the same persuasive work as the creator video you paid for — it is live social proof, attached to the impression, at no incremental cost. This is also why comment sections get attacked: spammers understand that the space under an ad carries borrowed trust, which is exactly what a scam link wants to inherit.
That dual nature is the moderation argument. UGC you did not commission can be your best asset or your worst liability, and under an ad it will be one or the other at scale. Curating it — hiding the malicious, letting the authentic praise breathe, publicly answering each buyer-intent comment so the exchange itself becomes persuasive content — is how advertisers keep the free UGC working in the ad's favor. Done well, the thread becomes an extension of the ad creative rather than a hazard bolted underneath it.
There is a research dividend too: comments tell you which lines customers repeat, which objections recur, and which phrasing they use naturally — raw material for the next round of UGC briefs. Advertisers using comment-to-DM flows go a step further, turning the most engaged commenters into conversations. The brands that treat ad comments as an asset class, not an inbox chore, get both the persuasion and the insight.