accountability. Using your real name on social media makes you much more accountable than using a pseudonym. Some people really believe in that (I do too, just not on most social media platforms)
What people put online and how they convey things are more about what people are innately than about putting real names and photos around.
Putting real names and identities also exposes people (those vulnerable due to circumstances or those who’re against commonly held notions in their social setting).
Also see: http://www.zephoria.org/thoughts/archives/2011/08/04/real-na...