Years ago we heard that Facebook was a silo. What was meant by this term is that FaceBook would pull content into its social network and behave like a portal, without allowing people to leave. It encouraged people to see the World Wide Web as Facebook and nothing else. For a while it worked.
Zynga and The Death of Conversation When FB was young, and vibrant it was a network of friends having a chat, until Zynga came along.
I know of Reddit and I have an account that I use every so often. I have never felt the need for a site like Digg or Reddit, because I don’t feel the need to look at what people are sharing and reading, and promoting or demoting. For a long time it felt like a website that had users, but had not updated it’s UI for years. The Issue
The problem with Reddit, Digg, lemmy, kbin and other alternatives is that they’re large enough for everything to be shared within seconds, and you get trolled if you share something that someone else has already seen.