How would we live without social networks?

In today’s world it is hard to go more than a few hours without hearing or seeing reference to Twitter, Facebook or some other social networking site, as it has now become part of modern culture. What started off as a tool for friends to keep in touch and up to date on what was going on in each others lives has now become so much more than that, and it is hard to see what we would all be doing with our time if we did not have these things to keep us occupied.