Yedda is a community-driven question and answer service. Users ask questions that people in the community answer, and others can comment on and refine these answers, as well as search for past questions. Yedda also offers the ability for community members to register themselves as “experts” for certain tags. When a question is posted with one of these tags, the community members registered to that tag are emailed for their response. The purpose of this service is to encourage people to come back to the site more often, and to ensure that questions are answered as accurately as possible. Yedda’s service is monetized through advertising and partnerships on other websites.

As of November 2007, Yahoo Answers dominates this space, with companies such as Wondir and Oyogi offering similar services.