I have to admit that this is a little old on the radar, but I was gone and seemed to miss this launch. Microsoft Research began offering its own variation of social search a few months ago called U Rank.
So what exactly is U Rank? The short version, from the service's home page, states
“U Rank is a search engine that allows people to organize, edit and annotate search results, as well as share information with others.”
It's a research prototype, so it's not available on the main Live Search page; indeed, it may never be. Microsoft says the project will help it learn more about how people use these kinds of technologies. One can only hope the information will help the company pull itself out of its distant third position in the search engine market. The project features its own blog, of course, open to any interested readers. If you want to try out U Rank itself, however, you must register.
So getting into Urank this is the open screen
So lets see how good it is..Lets search for Geoffrey Emery
Hey it found my blog #1 this thing is great!
As you can see you the search works well and then there is a side bar next to each of the side bars as you hover them. add copy move and delete.
Digging into the UI
Digging into each those UI you get Move, Copy, Add, Delete.
Move moves the ranking of the item up or down. It does effect the ranking of other searches people do. You could see people sitting around ranking themselves highest in all sorts of things?
Copy lets you copy one of the results to another search that you have if you do not have one already by that name it will create one for you
Note will let you add a little comment by the search. I am assuming that this just your notes although it does bring up a interesting idea of seeing everyone notes on the results could be interesting.
Delete removes the results from your rankings. Also makes me wonders if it makes results from that site less relevant.
It also allows for recommendations as you can see you can view only edits made by you and your friends.
Recommendations

Here is a list of all the things the research guys think it would be good for
- Organize and annotate results: write notes to summarize important information under each URL
- Lists: keep lists while you're researching ("hotels for my next trip", "DSLRs for me")
- Collaboration: Share URLs with friends ("related projects", "our reading list")
- Recommendations: Tell your friends what you like ("best books," "favorite restaurants")
- Multimedia results: Mix video and images with web results for added context
- Ego-boosting: Make sure your home page is #1 (at least for you and your friends)
- Easy to explore what your friends are sharing
- Short-cuts: Move your favorite sites up; then put an ! in front of the query and go straight to the top result
Find out more At http://www.microsoft.com/azure/URank.mspx
FYI Google launched something straight away to its real search last month as well after Microsoft launched this.