I've had a clearly fake name on Facebook for years. A couple weeks ago I got message from one of their reps, letting me know that there was an issue about my name, and that it was currently being reviewed. I had no intention to link that account to my real name, as it was mostly political whining and interaction with a few close friends. I basically told them that I wouldn't change the name and that they should just delete the account. A couple days later they responded by telling me that my name did not break TOS and that I was free to use my fake name. So I'm not even sure that policy is even enforced, steered... maybe.