I'm on it and love it. I've been able to reconnect with all sorts of old friends that I haven't seen in decades. It's an easy way to stay in touch, see what they are doing and not have to put any effort in it. My High School friends are 2,000 miles away.
I've also found that instead of the yearly Christmas letter type of thing, I am able to keep up with friends and family on a regular basis.
For me, it's been amazing to see their pics, hear what they are up to and have short conversations.
Best of all is being able to post pics and read friends comments. I used to send them in emails, and hated it. So much effort for something that a lot of the time, I never heard anything about them. Now, friends and family can comment on a picture, and even carry on a conversation about it. They are fast and easy to upload, add comments and share.
A suprise has been how much work I've gotten from Facebook. I stared sharing pics of some of the things I've done for clients and had some friends ask about them. I opened them up to friends of friends, and people that I don't know will call me about work they need becasue they saw my pics on Facebook. I haven't paid for advertising in over five years, and for free, I've made a considerable amount of money from just sharing my pics of what I've done.
Eddie