Interesting idea,just now i went to login and saw some of the AKB48 members were there.I think some other members are at the other side because the whole location was full (there are limits of people entering into one place).
Look at the picture below,noticed the spot that i circled...they are the AKB48 members.
Here are the screenshots of who i saw:
Kojima Haruna
Kasai Tomomi
Miyazaki Miho
Really wonderful...it seem like i am staying on Ameba for good.But the only bad point is...i don't understand what they are saying.Even though there is a China guy inside keep saying he is from China and is an AKB48 fan...well i don't know whether Kojima and the rest got reply him.