Robert Scoble has a great piece on what he calls the chat forum effect and why Twitter and blogs are much more useful as an information source than say a chat forum http://bit.ly/2PqD0b.
And while he is absolutely accurate in his assessment, he is way too in the weeds to see the larger story. Synchronous communication — as found in chat forums, or Facebook wall posts — are essentially synchronous forms of communication. No one owns the communication in the same way that someone owns the blog and also owns their Twitter posts — there are no comments and therefore no moderation needed.
Virtual worlds suffer the same problem as chat forums. Without an owner, virtual worlds descend to the depths of prurient or downright pornographic behavior.
Why is this? What causes synchronous forms of communication to descend down?
Perhaps its the law of entropy at work.