digg的开源项目：diggclone，基本功能都实现了。
The diggCLone project is an effort to reproduce the functionality of the oh-so-popular social bookmarking site, digg.com. We've changed up a few things about it, but kept how the site basically works. Right now, we're still in some of the early stages, though, so some of the functionality isn't there yet.
