Forum Bots, such as
Xrumer, are programs that essentially automate the registration and posting process for forums inlcuding access by proxy, using proxy scraping, scraping Wikipedia and blogs, scraping RSS feeds and automatic generation of gmail accounts and activation.
The owners of the bots can fill up the bot with predefined posts, or allow it to post scraped content, and then using created information the bot will access forums and use them for backlinks (links pointing to sites they are promoting using keyword rich anchor text) and also promote via pm based spam.
