If you haven't started implementing a social media strategy into your job search, start now! Pick any social media site and jump in. Fill out your profile and start making connections because everything you do adds to your chances of finding that next job.
Also, if you want to use more than one, try to find a third-party application that lets you manage multiple sites from one tool. TweetDeck allows me to manage Facebook, LinkedIn and Twitter all from one place. There is no word on whether or not Google+ will be supported. If they don't support it, I'm sure some third-party app will come along that supports all four.
The biggest trick to social media is making it easy for you to manage. If you have to spend all day maintaining your social presence, you'll never have time to actually go on interviews.