To post the same message or content simultaneously to multiple online platforms, forums, or communities.
Modern compound from 'cross' and 'post' (from Old English, meaning to station or display), created in the digital age to describe posting across multiple sites.
Crossposting is a major source of internet drama—when someone posts the same thing to multiple communities, it can spread misinformation faster, which is why many online forums actually forbid it and ban serial crossposters.
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