Facebook Inc. is planning to open its first San Francisco office — albeit a small one. The social-media company has a letter of intent for space at 181 Fremont, a new skyscraper in the South of Market district, according to a person familiar with the matter. Powered by WPeMatico

From https://www.bloomberg.com/news/articles/2017-06-12/facebook-said-near-deal-for-first-office-space-in-san-francisco