Yes, and increasingly so. The reason? People are forced to be more serious as well as more polite in their comments if they must post under their real names. The primary reason for the juvenile atmosphere in many Reddit threads is the fact that contributors mostly post anonymously.
Huffington Post recently changed its policy, now requiring commenters to post under their real names:
http://www.cnn.com/2013/08/22/tech/web/huffington-post-anony...
Quote: "Arianna Huffington is fed up with the trolls."
Well put. I've been posting under my real name since the days of Usenet, twenty years ago, when anonymous posting was almost universal. Now it seems the rest of the world is catching up.