From the website:

Flock is a consumer Internet business which has developed a free, next generation web browser. The company is focused on fundamentally evolving the browser, and bringing a refreshing new approach to how people use and participate on the web. Flock simplifies social and web-based applications by bringing them one step closer to the user and integrating them directly into the browser. People can easily discover, access, create and share videos, photos and comments across social communities, media providers, and popular websites.