There's always been several of these floating around but here's a new one showing up and in mass numbers! so be careful and DO NOT CLICK IT! And the ironic thing is that it states it will help prevent spam, when in turn it hijacks your account and spams the hell out of your friends!
It loads this script:
Which under further investigation loads a malicious script on another website that grabs all of your info, snags all your friends info and makes a post to as many profiles as it can, and the weird thing is that it shows it comes from an iPhone, making the spam a little more believable. I haven't seen that before but beware! If you have fallen victim to this change your password immediately and in your account settings see if any other facebook sessions are active and remove them. You will be ok after that.