That's what friends are for.
A startup named Eurekster has merged social networking and searching, ostensibly so "everyone can learn from the search activity of people they know and trust."
I may know and trust lots of people, but I'm not sure that my searches will be improved by understanding what they are searching for. Having working previously for a search technology company, I consider myself and expert searcher, often finding detailed information in one or two searches. I might therefore find my searching less effective if matched with even similar searches done by my friends.
What I would love to have is one service that would let me keep track of all of my friends, business contacts, etcetera, and then pull those into any tool (Outlook, Mozilla Thunderbird, blog templates,...) that I want, or just reference them from that service.

