I don't have a theory on the causes, but I'm not yet convinced this is anything more than the media reporting a trend that may not be statistically significant.

I don't have a theory on the causes, but I'm not yet convinced this is anything more than the media reporting a trend that may not be statistically significant. See also http://news.ycombinator.com/item?id=2079371 http://news.ycombinator.com/item?id=2079371