User-generated spam is spammy content that appears on a site through its own user-facing features — comment sections, forums, user profiles, guestbooks, unmoderated "submit a listing" or review forms, wiki-style pages — placed there by third parties to get links or exposure.
Definition
User-generated spam is spammy content that appears on a site through its own user-facing features — comment sections, forums, user profiles, guestbooks, unmoderated "submit a listing" or review forms, wiki-style pages — placed there by third parties to get links or exposure. Google lists it as a spam policy issue that can affect the host site's standing, not just the spammer's, because the host is publishing the spam.
Common forms are keyword-stuffed comments with links, forum threads created solely for links, and fake profiles with links in the bio.
The host site is expected to manage this: moderation, spam filtering, rel="ugc" or rel="nofollow" on user-generated links, noindexing low-value user pages, closing or restricting abused features, and cleaning up existing spam.
In context
For iGaming affiliates, user-generated spam is a risk anywhere the site accepts user input: comments on reviews and guides, a community forum, user ratings or testimonials, or a directory that others can submit to. These features attract link spammers targeting a gambling-niche site precisely because of its topical relevance, and if the spam accumulates unmoderated, it degrades the site's quality signals and can draw a spam action against the host.
The practical controls: moderate or filter all user submissions before they are visible or indexable; apply rel="ugc" (or nofollow) to every user-generated link; noindex thin user pages (empty profiles, tag archives); rate-limit and CAPTCHA submission forms; periodically audit for and remove accumulated spam; and close or lock down any feature that is being abused faster than it can be managed. If the site does not have the resources to moderate a feature, it is better not to run it.
For affiliate-facing content, the framing is that offering user features brings a moderation obligation, that unmanaged user-generated spam can penalise the host, not just the spammer, and that the fix is active moderation, correct link attributes, and indexation control — or removing the feature.
Worked example
An affiliate with an open comments section finds thousands of keyword-and-link spam comments indexed on its guides. It bulk-removes them, switches comments to pre-moderation with spam filtering, applies rel="ugc" to all comment links, noindexes empty user profiles, and adds CAPTCHA.
The site's quality signals recover and no host-level action follows.
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