Same here. I needed to work with their API, so I made a fake account to make some test and to access the documentation.
I have no intention of having my own facebook account, much less to have it full of debuging messages. If I created a real account, it would only annoy my real friend with messages such as "Test 1" and "sadsadasd".
I recently opened up an account for the sole purpose of being able to get into their API docs and haven't been back since. Am I a fake user?