Stack Overflow is a question and answer website for programmers and the flagship of the Stack Exchange network. Created in 2008 by Jeff Atwood and Joel Spolsky, it became the main place where developers look for answers to technical problems.
What it is
Users post programming questions, other users answer, and the community votes answers up or down. Participants earn reputation, which unlocks more privileges on the site. This model turned the site into a very large library of answers.
History
The public beta was announced on 15 September 2008. In 2010 the company raised 6 million dollars in a round led by Union Square Ventures. Prashanth Chandrasekar became chief executive in 2019, and in 2021 Prosus agreed to buy the company for 1.8 billion dollars. In 2023 moderators went on strike over the policy on AI generated content, and the strike ended on 2 August 2023.
Wikipedia reports that the number of questions fell 78 percent between December 2024 and December 2025.
Why it matters to founders
Stack Overflow is an example of a product whose value comes from its community and whose content builds a durable search presence. The reported fall in questions also shows how much a community’s activity can change when the ways people look for answers change.
Related entries
See Joel Spolsky, Community-led growth, Network effects and Vibe coding.
Stack Overflow is part of Communities and communication.
Sources
Wikipedia entry for Stack Overflow. Reviewed October 2026.
