This trick may help you to register on a same site many times using a one email ID, its simple.
First you have to make a gmail account if you already haven't one
Lets think your gmail ID is [email protected]
Now you can log into your gmail account with these all methods
[email protected]
[email protected]
[email protected]
[email protected]
[email protected]
[email protected]
Gmail doesn't count the DOTS... So with all above methods will sign into your gmail account and this helps you to create multiple accounts on a site using a one Gmail address.