San Francisco is the producer of multiple Internet-based companies.
The Internet is the global system of interconnected computer networks that use the Internet protocol suite ( TCP/IP ) to link devices worldwide . San Francisco . San Francisco is also the headquarters of five major banking institutions and various other companies such as Levi Strauss & Co. , Gap Inc. , Salesforce.com , Dropbox , Reddit , Square , Inc. , Dolby , Airbnb , Weebly , Pacific Gas and Electric Company , Yelp , Pinterest , Twitter , Uber , Lyft , Mozilla , Wikimedia Foundation , Craigslist and Weather Underground .