There are many dangerous creatures online.
From the Encyclopedia of Internet Dangers I give to you:
He lures you on to social networks to… well, bite your face off. When you are all alone online and all up on the stalking of your web buddies, he strikes with vengeance leaving nothing behind besides your keyboard mouse (they give him heartburn.) Then he surfs back online to find his next victim.
Next time you hear a crunch when you are typing it could be the social piranha claiming his next victim.