Seems FB was hacked earlier this afternoon. Everyone had masses of spam posted on their walls, it was appearing quicker than I could delete it! So if you see a message posted on your wall, or someone else's wall that tells you that if you want to prevent spam, you have to click a link, then don't click it - I think this is what releases the spam. Also if you get messages from your friends on your wall, messages that are not very nice and nasty, it isn't from them, but from the hackers. There are also people saying to allow the hackers to hack your page. I think they are actually hackers themselves. I changed my password and I haven't been spammed again.