Facebook has always officially had a real name requirement. The main difference between theirs and the much more famous one which Google+ had is that Facebook h

Facebook has always officially had a real name requirement. The main difference between theirs and the much more famous one which Google+ had is that Facebook has traditionally not been proactive about enforcing theirs, whereas Google engineers controversially made an attempt to implement the official policy in code like any other specification. (Disclosure: although I worked for Google years ago and did read an internal memo back then from employees which complained about this policy, my comment is not based on any secret internal knowledge. My own job had nothing to do with Google+ or the real names policy.)