title: Highly customizable social network platform
body: <p>I'm searching a social network platform, premium or free, that is complete, with good features, but 100% customizable to add my own features, and easy to customize.
  I want all social network's features, but i need to add my own code, object, classes and db.
  So i would to use php and find a platform with an easy logic structure to handle.</p>
  
  <p>I am a little confused, there are a lot of social network platform: elgg, buddypress, socialengine, but i don't understand if is possible to extend and how is difficult! :(</p>