Personally, I enjoy it just to be able to keep up with sons that live 50 miles from me that are busy and don't keep in contact with me. Also for family that I have that is spread out across the entire country.
As others have said tho...I never post anything personal out there. And I don't have my phone info listed at all.
IMHO...you have to decide for yourself if you would feel comfortable with it or not. Good luck. :)