Of course the government isn't ignoring it. They are even overreacting to some of the internet postings -- for example, like today with the football stadium games and radioactive dirty bomb nonsense. The government says this particular threat is not credible yet spread the story around anyway. Government doubletalk, idiocy.
There is massive amounts of money being spent by the US government to monitor the internet on massive scales. A lot of this is wasted and some of the idiocy involving foreign language (including romanized foreign language) postings is stunning. This is not a government that inspires confidence.