Ok, you’d probably have to be a fan of The Godfather and some knowledge of social networks to understand it, (not sure I do), but here’s a blog post from Social News Watch comparing:
Reddit as Sonny Corleone
Propeller as Fredo Corleone

Digg as Michael Corleone:
With more direct traffic than the other social media websites combined, Digg is the current Godfather. Choices made by Digg and by the masses of its members can make or break a story or a website. When Michael spoke, people got buried. When Digg speaks, servers can be shut down.

The media focus is always on Digg, just as with Michael. Its popularity has been a tremendous driving force in the growth of social media as a whole. If you ask Kevin Rose what he thought, would he say something like, “Every time I think I’m out they pull me back in.”?

Newsvine as Tom Hagen

Well, I was thinking more along the lines of The Sound of Music myself *runs off singing*