Stack Exchange

Stack Exchange is a network of question-and-answer communities powered by Stack Overflow, made up of 183 distinct communities covering topics such as Linux, game development, cooking, philosophy, mathematics and law. Users earn reputation for answering questions across these communities, and the network includes a moderator programme and a company blog alongside its question-and-answer sites.

Advertising on Stack Exchange includes dedicated company pages, sponsored media and targeted advertising sold as Stack Ads, through the sales house Longitude Ads. The site's ads.txt file lists 19 ad systems, with 14 direct and 11 reseller entries.