I did it two years ago. Never been a problem. Sms and calling still exist. People started to write me nice emails. The feeling you are missing something is gone arter two weeks.

Actually only thing that is somehow annoying are events. Its facebook secret sauce. They limit the api (you cant add events through api > no automatic repost) so every event around me ends up only on fb. I am talking about public events, concerts, lectures etc. Venues are using fb as calendar so much that many of them dont even put it on their own site anymore.