GALLERY: Dolby, Twitter and Uber world headquarters in San Francisco, CA

Uber's world headquarters in downtown San Francisco, Calif. (Jason Rzucidlo/AmericaJR)

The AmericaJR Web Team visited downtown San Francisco, California and visited the world headquarters of Dolby, Twitter and Uber. All three of these companies are located along Market Street just steps from the San Francisco City Hall. Twitter, Inc. is based in San Francisco, California, and has more than 25 offices around the world. Uber is based in San Francisco and has operations in over 900 metropolitan areas worldwide. Dolby Laboratories, Inc. is an American company specializing in audio noise reduction and audio encoding/compression.