everything I post on fb is impersonal and interest related. sometimes a cat pic but never family, myself nor do I post life happenings. As much as people would like to think privacy settings on fb is enough I don't believe it's nearly as protected as they want you to believe.

Making friends, and reconnecting to old ones is not an act of desperation it's normal if you're a person that is not so social IRL. I dont' see it as a bad thing and it could lead to making new connections and finding friends to meet in real life maybe at some point.

Post what you want to share, thre really are no rules to it. whatever you want to say about yourself and your life, whatever you want your circles or the public to understand or know about you.. post as little or as much as you see fit. And again as personal as you are comfortable with but just be cautious and informed that once it's out there, it's there pretty permanently and can be data mined.