OgOg.org is a Web application and site. On OgOg.org, you can rate RSS posts and receive good rankings and extra voting power when your own posts are rated as being good. You can carry your user-ranking and voting power over to other sites via OgOg's API (and your OpenID). OgOg attempts to be a useful hub in the sifting and ranking of blog posts.
StatusNet is a microblogging platform. A StatusNet site is a lightweight social network that helps a community, company, or group to exchange short messages, files, and data over the Web. Users can choose which people to "follow" and receive only their friends' or colleagues' status messages. It provides a service that is similar to Twitter, Yammer, SocialCast, or Salesforce.com Chatter.