Scoopler can be called as a Search Engine 2.0. Search for any topic, you will get results from live feeds of the web 2.0 environments.
The about page says:
Scoopler is a real-time search engine. We aggregate and organize content being shared on the internet as it happens, like eye-witness reports of breaking news, photos and videos from big events, and links to the hottest memes of the day. We do this by constantly indexing live updates from services including Twitter, Flickr, Digg, Delicious and more. When you search for a topic on Scoopler, we give you the most relevant results, updated in real-time.