A bunch of large sites use it for specialized tasks, and business insider uses it for everything. They have a list here: http://www.mongodb.org/display/DOCS/Pro

A bunch of large sites use it for specialized tasks, and business insider uses it for everything. They have a list here: http://www.mongodb.org/display/DOCS/Production+Deployments http://www.mongodb.org/display/DOCS/Production+Deployments