Mahalo Greenhouse is where talented part-time Guides (PTGs) help Mahalo create the best search results on the internet for terms Mahalo has yet to cover. PTGs are paid $10 to $15 for each search result approved and added to Mahalo.
C. Karande, K. Chellapilla, and R. Andersen. WSDM '09: Proceedings of the Second ACM International Conference on Web Search and Data Mining, page 272--281. New York, NY, USA, ACM, (2009)