@Kami:
Same purpose as you... Got me on facebook 'cuz majority of my classmates are there. Plus I can ask them bout exam dates and assignments and even chat with my aunt.
But other than that, I don't really like social networks other than FB.

Actually you can know that this is their real account if they are mentioned in their official sites. Eg. Jeopardy! has a official FB account mentioned on their site.
So unless you have real friends and classmates already, social networks like FB are suitable. Looking for people at FB, like Kami said, isn't recommended.
