title: What format do sites like Facebook use to store data for personal profiles?
body: <p>I recently started dealing with large sets of data stored in XML files.  I've always wondered how Facebook and other networking sites store all the information associated with individual profiles (name, profile picture, wall posts, etc.) and I feel like XML is definitely not the best way to store so much information. I've tried finding information about it with google but haven't been having too much luck.</p>
  
  <p>How do huge sites such as Facebook store and deal with so much data?  I would really like to do some reading about this, so if you know of any good websites please let me know!</p>