Facebook, the most famous Social Network Website, doesn't not allow multiple accounts with the same e-mail address, but it's possible to do that with a simple Gmail trick by using the same email address. This trick is caused by a small bug in Gmail because it ignores the dot (.) so the email xxx@gmail.com is the same x.xx@gmail.com or xx.x@gmail.com ... and so on.

How to Make Multiple Facebook Accounts with the Same Email Address

The Trick is very simple: Get a gmail account here, then Signup for a New Facebook account and add the dot (.) in the email address: 
Example :
RazorTuts@gmail.com
Razor.Tuts@gmail.com
Keep changing the dot (.) position every time you want to create a new Facebook account (e.g : raz.ortuts@gmail.com )
 Done!