I guess it all depends on the depth of your “friends” and what they have to say...nobody holds a pistol to your head to sign in so I only check it when it is convenient. The “friends” and family that I have allowed, post very interesting thoughts, activities, and photos and I try to make my few posts just as useful. I am now often in touch with extended family members that I value and I have found challenging blogs, news sites, and happenings I would have never known about. If you have intellectual curiosity it is a wonderful tool and it is secure if you want it to be.
Not even CLOSE to being secure