The Social Network movie portrays Facebook founder Mark Zuckerberg as a socially-awkward, insecure, devious, ego-maniac, but is it the truth? And if not, is that a problem?

Film-makers have always played fast and loose with history.

From war films to grand swords-and-sandals epics, screenwriters have put words in the mouths of historical characters that may or may not have belonged there.