On facebook we can use many features...like....tag...share....likes....comments.....chat..... wall post....app.....etc

on the other hand on g mail we can only read E mail...send email with...attchment......

gmail is only for mail....service..

Facebook and Google Plus is that while Facebook helps you keep in touch with the people you already know, Google+ helps you get in touch with the people you want to know.

You come to Facebook to find out whats happening in your friends lives. For me, it has done a good job of reconnecting me to old friends and letting me better know what's happening.
Google+, on the other hand, is the place to go if youre interested in sharing thoughts and ideas, commenting on events, or learning and sharing knowledge about science, education, hobbies, sports, entertainment or the arts.

Google+ is all about your interests which you don't necessarily share with your old classmates or colleagues

Face book used when u r alone, google is used when biwi is roaming around

Social network facebook