Crosspost

A crosspost is a Reddit post that shares the same submission to multiple subreddits, with a built-in link back to the original. Unlike a plain copy-paste, a true crosspost (using Reddit's crosspost button) preserves the source attribution and lets users see the original thread's discussion.

Crossposts are useful when content genuinely fits more than one community. A case study about scaling a SaaS app might be relevant in both r/SaaS and r/startups; a Postgres tuning guide could fit r/Postgres and r/devops. Crossposting respects each community's separate moderation and avoids splitting the discussion across identical-looking but unconnected threads.

The pattern is widely abused. Reposting the same self-promotional content into ten subreddits in a single hour is a fast way to get flagged as spam, shadowbanned, or sitewide-actioned. Reddit's spam filter and many subreddit AutoModerator configs look for cross-posting velocity, duplicate titles, and accounts whose history is mostly the same link reposted across communities.

Subreddit rules on crossposts vary. Some explicitly allow them with a flair; others ban any duplicate content regardless of format; others want a small framing comment explaining why this audience will care. The safer pattern is to rewrite the title and the framing per subreddit so each post reads as authored for that specific community, even if the underlying link is the same.

For monitoring tools like RedNudge, crossposts can produce duplicate-looking matches across subs. Deduplication usually keys off the original submission URL or post ID so the same conversation isn't surfaced multiple times in a digest.