I used to feel the same way about Facebook (I still feel the same way about everything else you said though) and then I deleted my Facebook. This will probably make my future career more difficult to not have one (this annoys the hell out of me), but I don't do social networking for these reasons. There is something subtly wrong and possibly even evil somewhere deep within the concept that is "Facebook", so I would just suggest deleting it. Especially if you don't get anything good out of it (at least you're not indicating that you do).