Some bots auto-revert changes that are likely to be vandalism or spam, like if an anonymous user adds a link to a blog on a free blog hosting site. (Specificall

Some bots auto-revert changes that are likely to be vandalism or spam, like if an anonymous user adds a link to a blog on a free blog hosting site. (Specifically, see http://en.wikipedia.org/wiki/User:XLinkBot http://en.wikipedia.org/wiki/User:XLinkBot .)