Blogging World

I have a friend/acquaintance who has a blog, so I decided to check out her links on the side.  I am curious to know if I am just overly paranoid, or if there are really freaks online who will look at pictures of my children (if I put them online) and track us down if I put too many distinguishing characteristics of us on my blog.  I know a lot of people who really put their life stories online, complete with photos and location.  Am I a paranoid freak for not trusting the mysteries of the online world with my life?  I certainly trust the web with my credit card information when I make purchases.