1. Tips for Job Seekers Using Facebook
Facebook is a social utility that connects people with friends and others
who work, study and live around them
Tips for Job Seekers Using Facebook
Make all your details private, so that only friends can see what you post. There are privacy options on networking sites for a reason.  Make use of them.  But do remember that these settings are not foolproof.
Take care when adding co-workers or bosses to your friends’ list.  Make sure you know who to add and who not to.  Sites like Google Plus offer the option of adding different people to different circles. This could be made use of to your advantage.
Make friends with only people you know.
Be totally aware of what you post.  Before making any update to your status, see if it is completely harmless.  Ensure that it does not tarnish your image in any way, or embarrass you.
When you update or upload something, think of its long term consequences.

2. A person is known by the company he/she keeps. So make sure that
Keep pictures to a minimum, especially those that portray you in an unprofessional way.
Be mindful of what you “Like” on sites.  Photos, videos or links that you choose to “Like” may portray you as racist, sexist or even childish. 
When you comment on other people’s walls, or blogs, be aware that these might be shared, and might be public.
If you have a blog in your own name, never, ever, write anything about your job or your company, or your work, or anything related to it.  If you write under a pseudonym, then you can be more relaxed, but even then, don’t put up pictures, and make sure that your co-workers don’t know about your blog.  There have been innumerable instances of people being fired by what they wrote on their blogs.
A person is known by the company he/she keeps.  So make sure that
you know who you are linking up with, or following.