How can I uniquely Identify facebook user

How can I get the global facebook link

http://ift.tt/1DjXPd8

using v2.2 of facebook API,

Actually my application needs facebook friends and their globally unique facebook ID, I am thinking to get the friend names using taggable API but how can I get the unique facebook ID? or it is not possible at all ?

If somehow I get this global link for a user, I can extract the global ID

http://ift.tt/1DjXPd8

(I know its not possible using their API directly, but there must be some workaround that one can use)

PS : facebook new API changes sucks for many many apps.