I'm of the view that the growth and community killed Digg. Once Digg hit critical mass, they were killed by the signal to noise ratio. I stopped visiting the s

I'm of the view that the growth and community killed Digg. Once Digg hit critical mass, they were killed by the signal to noise ratio. I stopped visiting the site a couple of years ago because of that. The reason why HN thrives is that the signal to noise ratio is still quite high, and while there is diversity in the submissions, you can probably group them into a few common themes.