Some of you may already know the trick,but I am sharing this trick for those who don't know and for the newbies...!!
Guys,you can verify unlimited facebook accounts with just one gmail account by getting all the verifications mails to one email Id..
I take 'firstname.lastname@example.org' as an example ...go to www.facebook.com, fill the signup form,enter you name,DOB,etc but in 'email address' field enter any fake email address like"email@example.com" or anything rubbish... ,click on signup button,skip all other signup steps....after skipping all the steps,you will get a message about email bounce and that they could not find your email address.Now click on 'change email address' ,enter your password and put your actual email Id with dots in the username... e.g. Use 'firstname.lastname@example.org' .....and guess what? The verification email will be sent to email@example.com(if you don't get the verif. Mail,it means username 'c.ooldude' is already in use,which is a rare case)
Now,signup for another facebook account and repeat the whole process and this time use 'firstname.lastname@example.org' ...then 'email@example.com and so on.... After you have used the dot after every letter in your username ,start using 2 dots in your username e.g. 'C.firstname.lastname@example.org' ,keep shifting the dots ,get all the verification mails tothe same email id and thus verify unlimited facebook accounts..!!