It will become YouTwitFace.
We would have Facebook.
Kendall from big time rush is not cousins with Selena Gomez. They Just happen to be friends. For more info google it youtube it facebook twitter or somthing.
No. Johnny's Entertainment, the company Kamenashi Kazuya belongs to, does not allow its idols to have social networking profiles such as myspace, twitter, facebook etc. So if you do happen to find a profile, its fake.
It's still up and running. It probably might not be the most popular site, nowadays since there's also Twitter, Facebook, etc.
Facebook IPO was set for May 18, 2012.
Usually this will only happen if you have violated Twitter's terms of use which you agree to when you sign up.
nothing much
he will kill you
The world will explode
Not really if it does its your fault
For Now it's facebook.. But don't know what happen in future.