Which social bookmarking site you prefer Propeller or Digg? I prefer propeller because it gives huge amount of traffic.
I use both. I find that it helps index my site faster if I use both services. Some traffic does come but not as much as it use to. Besides, now thay both use the "nofollow" att. so no link juice from them.
I actually enjoy utilizing both of them. I use to focus on just Digg, but now I am focusing on using both for my websites. It helps out greatly for traffic, but it is something you need to keep up with to work properly. Social bookmarking is something I've just started to use regularly and I really do love the results received.