For me it has allowed me to keep in contact or reconnect with friends. As we have all grown up and went on with our lives we have moved all over the country and world. It is great to know what everyone is up to. This year a friend went to Nepal and did some hiking. He didn't go on Mt Everest, but he could see it. He was sharing pictures while on the trip. Plus when my nieces travel the do quick posts and you know they are ok.
For me, two good friends of mine left and ony after they'd left did we realise we didn't have each others number, Facebook completely solved that issue, now we text or Fbook a few times a week... but one other who I text EVERY weekend suddenly... just stopped... I kinda think he hates me for no reason.