The reason that Facebook is popular, I think, is that when one longs to see one of one's friends, it offers immediate gratification: your friend is here, and talking; come visit.
This is, of course, an illusion. Your friend is not there, and he is not talking. If you pay him a call, he will not recognize that you visited. You will not even have left footprints in his yard, or a card with the butler. You have, in fact, not interacted at all.
You would do better to think of a reason to telephone.