The Social Network Blu-ray is amazing and right now you can get it on Amazon for $16.99. There are 2 commentaries (one by director David Fincher, the other with writer Aaron Sorkin & cast), a documentary on the making of the film and a handful of separate featurettes. Usually these types of extras are kind of lame but everything on these discs is incredibly informative. You can’t watch these and not come away with an even greater respect for the film.
And aesthetically it’s probably the most beautiful packaging design (courtesy of Neil Kellerhouse) on any DVD or Blu-ray that I’ve ever seen. (Sorry Criterion, it’s time to step up your game.) So much care has been put into every aspect of it’s presentation from the menus to the packaging to the quality of the behind-the-scenes material that it makes me mad that other films don’t care this much. This is how you win awards.