Stack Overflow This story is available exclusively to Insider subscribers. Become an Insider and start reading now. The European tech investor Prosus is acquiring developer Q&A site Stack Overflow for $1.8 billion. Prosus is Tencent's largest shareholder and has invested in other edtech companies like Codecademy. Stack Overflow plans to expand internationally and build its advertising and subscription business. The popular developer Q&A site Stack Overflow is getting acquired by the European tech investor Prosus for $1.8 billion and its CEO says the move will help it expand the impact of its global community. Stack Overflow, which was founded in 2008, says it has over 100 million monthly users who visit to ask and answer questions about coding and other technical skills. The deal will close by the third quarter of 2021, and even after the acquisition, the company will continue operating independently.