Many users won't put their email address at all in the profile, and many would allow only a certain "collection of friends" to view it.

@woodpecker
Dear friend,

                  I am not just talking about "email" , it can be any field of registration (Since i have also add various fields in registration form) , as for as "email" ,  it is compulsory field in my form.

Hemant Kumar Upadhyay
FiveE Technologies , New Delhi ,India
http://www.fivee.in/