I randomly came across this site.
From their About section:
"Omgili is a specialized search engine that focuses on "many to many" user generated content platforms, such as, forums, Discussion groups, answer boards and others."
I'm sure there are better examples of sites like this, but I was drawn in by the design more than anything. I don't like the color scheme.
Do a search for "dating" and notice Buzz Meter that shows up on the right side.
I'd love to see Google incorporate historical popularity of search terms next to results, or have it as an option on the Personalized home page. Google already seems a little more cluttered with the new interface.