Wikipedia
Answerbag (known colloquially as "AB") was a collaborative online database of FAQs, where questions were asked and answered by users. Instead of the one question—one answer model, multiple answers to a given question were presented, in descending order of user ratings. As of December 2006, Answerbag was the second largest social Q&A site next to Yahoo! Answers. In a comparison with Yahoo! Answers and MSN Live QnA, Cnet declared that Answerbag was neck and neck with Yahoo! Answers.
A user who had created an account can ask and answer questions, comment on answers, rate questions and answers, and suggest new categories. Users had profile pages where their points and submissions are reviewable by other users, and 'leaderboards' show current and all-time contributors in categories such as "Most questions asked" and "Most positive ratings received." Answerbag was closed abruptly and unexpectedly by OnDemand Media on December 15, 2015.