your account is being reviewed, come back in two hours
The only thing similar to this that shows up on Google is related to either accounts that have been reported for whatever reason, or accounts that have been recently reactivated.
I find it funny that you think someone from Facebook is personally checking your account, and that to do that they need to suspend your account for 2 hours. All of their information gathering will be done automatically and be going on all the time, with the user's account fully active.