Social Mention is a social media search engine that searches user-generated content such as blogs, comments, bookmarks, events, news, videos, and micro blogging services.
Search results are aggregated from numerous popular social media sources, including Google blog search, Twitter, Delicious, FriendFeed, Flickr, Digg, YouTube etc. and remixed as a single stream of information. The data is fresh, which means you can track conversations as they are happening in real-time.
In addition to web-based search results, Social Mention also features email alerts and personalized RSS feeds for automatic and instant updates.
Links : Go to Social Mention.com