I'm on it. I used to not pay it much attention, but once I got a "smart" phone, I found that it was much more fun to use that way. Like anything else, there are positives and negatives.......positives, it is a really good way to keep in touch with family and friends, share pictures, keep up with interests, hobbies, groups, political candidates, etc......negatives, alot of people use it like twitter and think they have to tell let the world know when they eat, pee, cut their toenails, etc.
I am also a semi-professional photographer and it is a really good way to share pictures and get my work and website out there to people.