2. How many accounts can I open ?

There is no limit to the number of accounts that you can open. And remember, each account that you open comes with a matching e-mail address, so if you need 10 separate addresses to work with (and some people need more!), simply open 10 accounts.

Here's a hint: To make it easier to keep track of your accounts, most people simply add increasing numbers to the tail end of their username (i.e. toocute, toocute2, toocute3, etc.)