Sarah Palin and Rush Limbaugh, who have FB pages and use it regularly, may not agree with you. There are millions of FB users. Just like on Free Republic, there are some very bright people, and there are some who aren’t so bright. In fact, Freerepublic has a FB page, which comes in handy when FR goes down. Many FR users use this option.
No doubt your examples are referring to professional PR operations. Not the dufus who give up their privacy and the privacy of non consenting others to make pretend personal relationships.
Facebook has a high powered facial recognition engine that builds relationships based photographs. I may be in a few peoples photographs and be flagged without granting consent in any way. 98% of facebook users are probably oblivious to what is being done with their information, but they feel good because they can belong.
I stand by my comment.