My guess would be @Brute. He usually catches people that make multiple accounts (plus, moderators can view IP addresses). And since no one got caught using the rebecca black account during those times, it kind of eliminates many people.
Beyonce was Aerospark? heh lol. I do remember Pussydestroyer(double digit numbers) being FiendBusa I heard, that account survived for a month surprisingly.
Yeah Brute wasn't moderator at the time, so the Rebecca Black and the other accounts that time were mostly prowling threads in late sign in dates.
@Jadeinchains: This is my one and only hint. The person who has this secondary account has not posted in this status update as of the time of this post.
Second Accounts -
@AnnoyingBecky = Brad
@Beyonce = Aerospark
@Rebecca Black = ?