There's a "virus" going around on Facebook right now, and it seems to have spread rather quickly. A link to a website will be "liked" (recommended) by someone on your friends list. The link says "The Shocking Tattoo That Got This Girl's Parents Arrested" and the link appears to take you to a Blogger page. Embedded on that blogger page is a redirect that exploits the "like" button feature and adds this link to your Facebook profile.
I've been unable to find any official release from Facebook regarding this exploit, however I have seen people recommending that once you see this link on your profile you remove it, change your Facebook password, and run a full virus scan. While this advice couldn't hurt, I think it's overkill, it's unlikely that this type of exploit would compromise your password or your computer system, most likely just removing the recommendation or "un-liking" the link will suffice.
If Facebook releases anything on this, I'll update this post.