By this point I might just sound like some sort of crazed Sorkin fanatic, but when it's this good it can't be helped. There aren't enough superlatives to describe it - rapid, witty, exciting and - most importantly - never dull. It's just people talking in rooms but it never loses it's energy or sense of progression. One scene bounces into the next, flying between depositions, bars, coding, parties. It's funny, but by the time you've laughed it's already moved on. It's in the rhythm of the words and the inflections of the acting. Jesse Eisenberg plays Zuckerberg like a fizzling robot, firing off the lines with dry emotionless aggression. Andrew Garfield plays the good guy left behind. Justin Timberlake is the sly but suave antagonist who gains the confidence of the king. Most of these characters are completely horrible but, somehow, completely watchable. There's so much going on it's difficult to remember a lot of it. I could have watched it again straight after leaving the cinema. It makes you realise how good a script can be, how a director can hand the reigns over to the actors and the words. Inspirational stuff.
It's like watching the best West Wing for the first time. Classic Sorkin, and classic everything else.