Hello there,
some might have heard it already: seems like a virus is going around steam, it sends a link to everyone in the friendlist of an infected pc.
Don't click on links like "WTF DUDE", which is followed by a link that prevents to take you to an inamge hosting website. (this link contains "img-12").
If you click on it, you will get a virus on your computer that will spread it around and send the same kind of messages to other people on Steam (all your friends).
I hope everyone knew that already and my warning was not neccesary 
