Is it really a problem for fully grown adults?

Are that many people actually on Facebook? What happened with people actually picking their phone to make a call or visiting friends in person instead of posting on their wall or twittering them or tagging them or whatever else it is now a days.

Personally speaking, adults should get themselves off facebook and leave that for the kids who started it when it started 6 years ago in a Harvard dormroom and spread like wildfire to other schools. Its is good for kids and that is about it.