With everyone eager to see the video on Osama being shot, spammers were extremely quick to take advantage on this. Many people were fooled by this message on their facebook wall (Osama Dead - Censored Video Leaked" by wikileaks some more):
Look carefully, the "Welcome" on the left is different! It has two tiny wheels, which means that it is an application. So, there is something running....
Just be careful with what "friend" sent as they could be spammer. There were just too many lately and we have no clue what the codes are doing to your computer. Normally it asked you for permission to access your profile.
(Thanks to my son, Ah Jon, who explained to me some of the more technical aspect of the code).