It is amazing what people will put on their Twitter page. Doing research on someone's social media is relatively easy to do and can be very useful in litigation.
If you want to download info from Twitter, for instance, you can now download an entire user's Twitter timeline pretty easy. In fact, there's a new post on Lawyernomics that gives you the exact process. With a little digging and effort, you can figure out a similar process for Facebook, etc.
The Twitter download steps are explained here (click here).