I keep an account on Facebook. But there were times I had thoughts about deleting it. When I shared this to one or two of my closest friends, one a lonely female who never married almost begged me not to close my account, as she takes a lot of comfort in some of my witty remarks posted.
All of my friends are people I know personally, and on the privacy settings, I avoid the "Friends of friends" option. Like this, people I don't know or only see me around from time to time don't have access.
Nevertheless, I have never posted my home address or telephone number on my profile, all my friends have these without the help of Facebook, and my e-mail address is reserved for friends only.
Like this I can enjoy Facebook without feeling that my privacy is under threat.