I have written often about online security issues. Here's one more:

Facebook has decided to retroactively move more information into the public, indexable part of profiles. The new profile parts made public are: a list of things users have become 'fans' of (now renamed to 'likes'), their education and work histories, and what they list under 'interests.' Apparently there is neither any opt-out nor even notice to users, despite the fact that some of this information was entered by users at a time when Facebook's privacy policy explicitly promised that it wouldn't be part of the public profile."
In fact, Facebook recently removed its users' ability to control who can see their own interests and personal information.
You can read more in an article by Kurt Opsahl in the Electronic Frontier Foundation's web site at
http://www.eff.org/deeplinks/2010/04/facebook-further-reduces-control-over-personal-informationHow much of
YOUR personal information is being divulged to others on Facebook?