.
Because Verizon Media is choosing to shut it down (just as they did Yahoo Messenger and Yahoo Groups). No specific explanation was given, but considering the significant decline in quality of content on the site versus the cost of cleaning it up and keeping it running, it's not a surprise (a disappointment, but not a surprise).
Variable 46
It's mostly just run it's course. But also I doubt a progressive (or at least fearful-of-progressives) business like Verizon wanted to support an outlet for anti-progressive comment and rhetoric.
Pearl L
it could be cause of all the rude questions and answers people post