See the following example
Suppose There is a Gmail account : Example@gmail.com
with password : abcd
You will get logged in to example@gmail.com If you use
email as : E.xample@gmail.com
password : abcd
email as : Ex.ample@gmail.com
password : abcd
email as : Exa.mple@gmail.com
password : abcd
email as : Exam.ple@gmail.com
password : abcd
email as : Examp.le@gmail.com
password : abcd
and so on..
That means gmail does not count periods (.)
So you can use this trick for using the same email for various GPT, PTC, Twitter accounts as they interpret all the above emails as different but gmail considers it the same.
Have fun making many accounts from your single Gmail account...
