SPEAR Algorithm

“The graph-based SPEAR algorithm (Spamming-resistant Expertise Analysis and Ranking) is a new technique to measure the expertise of users by analyzing their activities. The focus is on the ability of users to find new, high quality information in the Internet. A great benefit of SPEAR is that it actually returns two very interesting results at the same time: first, a ranked list of expert users; and second, a ranked list of high quality Web documents.” — via the delicious blog