Node.js is notably absent.
Github's trends offer a different viewpoint: https://github.com/languages/
Most corporations would faint just with the idea of hosting their code outside premises.
It's TIOBE. This is to be expected.
http://www.tiobe.com/index.php/content/paperinfo/tpci/tpci_d...
http://developers.slashdot.org/comments.pl?sid=3364265&cid=4...
Actually I would say HN and Github communities tend to certain extent to overlap.