responsibility requires control
Facebook: Small, independent teams with both responsibility and control. Small teams allow work to be done efficiently, quickly, and carefully. ultimate team coins Only three people work on photos, for example, the largest photo site on the Internet. But responsibility requires control. If a team is responsible for something they must control it.
For example, Facebook pushes code into production everyday. The person who wrote the code is there to fix anything that goes wrong. If the responsibility of pushing and wring code are split, then the code writer doesn't feel the effect of code that breaks the system. Compare this to the typical separation of developers, QA, and DevOps.
Facebook: Move Fast. At every level of scale there are surprises. Surprises are quickly dealt with using a highly qualified cross disciplinary team that is flexible and skilled enough to deal with anything that comes up. http://www.eafifa15.com/ Flexibility is more important than any individual technical decision. By moving fast Facebook is also able to try more options and figure out which ones work best. Compare this to the typically heavy weight planning and development processes.