Facebook FQL exploit
Well its been long said that face book is easy to hack and over the past years we have seen this proved over and over again with hacks happening in many different forms and ways and also a lot of worms and scams have made way onto the social network as well. Just recently https://www.blackhatacademy.org/ have published a page a the Security 101 wiki that has a fairly detailed explanation to one of the most recent Facebook hacks that Facebook is yet to fix. This attack goes for the custom SQL that they use and call FQL (Facebook query language) which has long been debated over its security and usability. Most if not all applications now days use FQL which is why this is such a risk as a whole.