Flock is a web browser founded in 2005 that allows users to stay connected to social networks like Facebook and Flickr while browsing the web. It integrates these networks directly into the browser through sidebars that display updates. Flock makes money through search deals with Yahoo and partnerships with companies who can promote their brands through a customized Flock browser. It allows users to easily access and share content across various social networks without having to switch between different applications.