Discovery Widget Launches on washingtonpost.com's MyPost Personal Profile Pages
Intelligent search technology powered by Searchles auto-assembles a user-generated tag cloud based on consumption -- both quickly relaying user interests and expertise when viewing profiles as well as serving as a basis to offer a display of related users. A 'searchle it!' bookmark button will also be installed on washingtonpost.com articles, pushing content out to Searchles' community of users as well.
I am not clear on how this is different from Sphere.