Talking about zuck, I can say that without facebook/whatsapp I wouldn’t have kept in touch with old friends (nobody has the same email and phone number now). A few week ends ago I managed to organize a weekend out with some old friends and it was one of the best thing I’ve done in years. I highly recommend trying to get the old gang back together for a weekend or more if you can afford it. First step is to create a whatsapp group.