I think mostly yes. It depends how mature they are really.
Sure
Because of the hormones, and the things in news that they can actually start to relating to. The only thing Nine yearolds can relate to is rapes and murders.
yes
no because they can get sick
Nine does not equal thirteen! I suggest not lying, because you can be banned forever.
Here is a good history of twitter: http://profilerehab.com/twitter-help/history_of_twitter
depends on what kind of chat your talking about if facebook no if twitter no but you can get a e-mail on hotmail.com when you are nine
teach 3 yearolds how to not wet themselves?
Miley Cyrus deleted her twitter for good.
8:00 oclock
babysitting
* There is no point in Twitter unless you want everyone to know where you are.