If your getting a comment on your profile saying: "Hey do you exchange this http://pic4web.org/gallery/image70121.png ? cna i offer a knife for it please chack screenshot" DON'T CLICK IT AND RUN WHAT YOU DOWNLOAD FROM IT. I tried clicking on the link and running the screensaver thing that I downloaded form it, and it messes up my steam launch, so i got logged out and it wouldn't let me log back in.

I can guarantee its a scam because all posts by different profiles making the posts were made at the same time, the profiles are all private, and level 0.