This is exactly why i made my facebook private, made all posts and pictures private, made it so people cannot message me unless they are my friends, changed my name on facebook to become unsearchable by employers. I do not add my coworkers to my facebook either. It will never happen and i dont care if they want to or not. Nobody needs to know anything about me unless i want to share it with them.

On linked in and other stuff I just have it all professional and what not but still don't reveal my contact information.

What i do is give them a link to my linked in.