how to get some one's gmail adress when i have his user name of facebook?

[Shaban]

[Daniel]

The Only Way Would be to Look At There About Section And See if it Displays There Email Address if it Does Not Show it Than That Person has There Email Address Set to Private So Nobody Can See it So you Would Not Be Able to Get it

[Akshay]

Go check his Facebook information (you can click on "about" if you're on phone) and see there. If it isn't there, there's unfortunately no way to find out his Gmail address.

[Jim]

Easy:

1) Go to the person's Facebook page
2) Send a Friend Request
3) Once approved, message the person and ask for his/her Gmail address.

OH! You meant without their knowledge?!? Do you really want people to be able to get YOUR email address without your knowledge? That knife cuts both ways.

[jaman]

SIMPLY CHECK HER PROFILE DETAILS.......

[Eva]

Just go there profile, and if his/her not set any privacy on their account then you will easily see the all information about his/her.

[Marry]

Check out person profile, go to their about us option and look there.