Think future employers won't look you up on Facebook or MySpace after an interview?
Be conscience of what you post on any social networking site. You don't know who might be checking them out.
Just because the content and pictures of you are not while you were working, employers may feel those postings are just as good representation of you as your resume or interview.
If your social sites are open for anyone to view, go through the content and ask yourself if there is anything that paints you in poor light. If there is, you may want to make some changes.