Linked-in is a great tool, although I have seen many recommendations not to buy the premium package as it doesn't really add much to a job search. Facebook is a double edged sword. Employers absolutely do look at facebook pages and will gain an impression from what they find on a candidates. If you were to look at my page, you will find around 200 pictures that have been posted . . . none of which I posted. I often go through my profile to make sure that I approve of what is there. So far I haven't had to delete any pictures or information. I coach my students to do the same.