Stack Overflow

Stack Exchange Inc. operates a network of question and answer sites. It builds libraries of questions and answers that a...

a16zAcquired

What they do

Problem

People need a reliable way to ask questions and find high-quality answers from experts across many topics.

Solution

A network of community-driven Q&A websites that curate and rank questions and answers into searchable knowledge libraries.

Who it's for

Developers and other domain experts and learners (e.g., programmers, researchers, photographers) who ask and answer questions online.

Joel Spolsky

Jeff Atwood