The similarities are amazing, especially considering Reddit was one of the succesors of Digg. They can now enable other successors by making stupid decissions and alienating core users.
I wonder if this speaks to the unsustainability of platforms like these, or the cycle can be broken by making good decissions.
If I had a couple of million bucks to spare, I would love to set up a reddit based on the wikipedia model. Self-governing, self-funding, independent.