There is a new social search engine on the market: Sproose. I just had a quick look at it to see what it has to offer.
Users are able to vote on search results, votes range from 1 to 5. They can even decide to exclude a site from search results. It is really cool to see that the ranking of a voted site is changing immediately. Also users can tag search results, start discussions (based on those results) and bookmark the sites. It works really good.
There is also a profile page with tabs for messages, bookmarks and a basic blog feature. Nice, but nothing else. At least so far.
Sproose looks ok but not special in any way. That is especially true if you compare it to other social search engines like Wink for example. Though Wink offers more features like people search and collections.