My DH uses FB quite a bit - he has a gourmet food truck blog which he links with FB and he has an old boys rock 'n roll band and has a FB page to let his friends know when they are playing at one of the local dives.
I was not much of a FB user, only looked at it now and again to see the kids pictures and keep up with former co workers following the closing of a company, BUT, recently I have been using it to follow the Oscars. My DH and I won tickets in an international lottery to be seated on the Red Carpet bleachers for the attendee's arrival to the Oscar's telecast and we have been getting all our info and instructions (many many rules!) for the event.
But, one thing I am very careful about is the ramifications of what one writes, adds, or comments on on FB. It will never go away. I am job hunting and have been quite surprised to have been asked by potential employers to "friend" them so they can see my FB page, same with Twitter.