Ask Jeeves is feeded with Teoma.com 2.0. It measures the authority as well as the popularity of web sites. It powers other search engines, specifically Ask Jeeves, as well as powering its own search engine. Teoma uses what they have branded as Subject-Specific PopularitySM that ranks a site based on the number of same-subject pages in other ranked sites that Link to it, not just general popularity (page count), to determine a site's level of authority.