You can't unless they are tweeting and their tweets show up on your timeline .
No this is not possible.
Tweet them.
No there is no way of knowing this.
No you can't.
You could tell them to stop. Or you could report it to Twitter
When you reply to someone (and therefore their username is in your tweet) it will appear in their 'mentions' tab (the @username tab on the right hand side).
it means to kill someone and eat popcorn,swiss cheese,a on someone when you are eighteen.23$@# email me at twitter@heoaktree.com
You can normally tell by the number of followers that they have. A lot of celebrities are starting to have "verified" accounts too which means Twitter have verified that they are the real person.
On Twitter, you can invite your msn contacts to join Twitter.
No, you can't email someone on Twitter. You can direct message them (if they follow you), however, which is kind of like emailing someone.
There is no such thing as a "Twitter spree." Maybe it's a reference to someone using Twitter excessively.