We seem to have pointed out rather often recently that giving away lots of information on Facebook, Twitter and other social network sites isn't a good idea.
PleaseRobMe claims, somewhat amusingly, to be a resource for burglars, saving them the trouble of searching through Twitter and Foursquare for information on whose house is currently unoccupied. In fact, what it's doing is scooping the info from Twitter et al.
More (with links) at http://avien.net/blog/?p=442.
David Harley CISSP FBCS CITP
Director of Malware Intelligence
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Author David Harley, ESET