This article mentions that digg was "outmaneuvered" by Facebook and Twiiter. But I don't think they are even really related, I was a Digg user in the early days

This article mentions that digg was "outmaneuvered" by Facebook and Twiiter. But I don't think they are even really related, I was a Digg user in the early days and it's Reddit that killed Digg in my opinion.