Facebook market cap history and chart from 2009 to 2019. Market capitalization (or market value) is the most commonly used method of measuring the size of a publicly traded company and is calculated by multiplying the current stock price by the number of shares outstanding. Facebook market cap as of November 18, 2019 is $556.38B .
https://www.macrotrends.net/stocks/charts/FB/facebook/market-cap

