FriendFeed is a feed aggregator that consolidates the updates from social media and social networking websites, social bookmarking websites, blogs and micro-blogging updates, as well as any other type of RSS/ Atom feed. Users can use this stream of information to create customized feeds to share (and comment) with friends.
Bloggers writing about FriendFeed have said that this service addresses the shortcomings of social media services which exclusively facilitate tracking of their own members’ social media activities on that particular social media service, whereas FriendFeed provides the facility to track …

Mixx is a user-driven social media web site that serves to help users submit or find content by peers based on interest and location. It combines social networking and bookmarking with web syndication, blogging and personalization tools.
Users of Mixx can control a personalized blend of web content that includes text-based articles, images and videos. Mixx users can search and discover media relevant to their interests, and interact with friends and other Mixx users who share their common interests.