Yes this is possible. You can sign up via text message. Follow the related link below for instructions in Twitter's Help Center on how to do this.
No sorry.
To get more than one twitter attached to the same email address, you must deactivate one email and make another. Only one twitter can be made per email. To get more than one twitter without deactivating, you must connect other twitter accounts to a different email address.
You can change your email address in your settings.
twitter@posterous.com is the email address to notify twitter.com
You can't use the same email address again.
Since you can't search for people on Twitter through their email address, you can't.
Email addresses are private. Her Twitter account is @yelyahwilliams
I don't know their email address but you can follow them on twitter =)
No your email address will never be given out.
Get an email address.
@Princeton143 twitter
You need an email address.