This trick can be very useful when you have to recieve verification mails or when you have to open multiple accounts for same service.
The trick is simple. Consider the email id something@gmail.com
Add as many dots(.) in something . For example , some.thing@gmail.com , so.mething@gmail.com etc are all same and any mail sent to these ID’s will reach to something@gmail.com
So when registering for another account of FB next time, just play with the dots.
Note: May be this is a known trick 
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