There is a hack for vBulletin which allows to create a usergroup for search engines and once they crawl the site they are treated as registered users, so they have more access to the site, and they are also showed in the users online list. (it's a standard feature on IPB, but you have to use a hack for it on vB).
vB already recognizes bots (although it has a small list of them, but it can be expanded) and automatically "logs them in".



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