Yeah I have avoided joining FB for those reasons. When people ask me why I'm not on it (usually incredulously) & I explain it too them they either laugh & call me paranoid or look a little sheepish as if there having second thoughts about baring there ass to the entire world. I also don't want my dopy friends 'tagging' me everywhere I go as there are times when I don't want the missus to know what I'm up to ; )
On a similar note...
http://www.bbc.com/news/technology-28055909