I think an overlooked benefit of Facebook and other social media, is that it makes harder for people to compartmentalise their lives. By showing the same side of ourselves to friends, colleagues and relatives we are able to be more genuine and authentic (congruent in counsellor-speak).
Many people I know find it hard to mix and the idea of having a gathering of people from different walks of life is an impossible one. Perhaps the younger generation will find this easier.
Of course, keeping safe and appropriate boundaries is important, and like so many things we learn by experience; another way of saying we get it wrong first time round.