tedster - 9:41 pm on Sep 2, 2011 (gmt 0)
Here's a paragraph from Guy Kawasaki's recent book, Enchantment - explaining why he developed a social network page on Facebook for his new title, rather than building a dedicated website:
The identities of Facebook users are more reliable. For example, on a web page, anyone can post a comment using any identity. When people post a comment on Facebook, they are much more likely to be the real person.
I think the phenomenon Guy mentions here has a lot to do with why Google wants the use of Google+ to be linked to real identities.
And as for WebmasterWorld allowing anonymity, even at our scale that kind of elbow room takes a lot of work to keep things "clean". That much active moderation wouldn't scale to the size of a Google social network.