I'll give you a brief info bellow:
Worldwide, there are over 1.65 billion monthly active Facebook users (MAUs) which is a 15 percent increase year over year. (Source: Facebook as of 4/27/16) What this means for you: In case you had any lingering doubts, statistically, Facebook is too big to ignore.
4.5 billion likes generated daily as of May 2013 which is a 67 percent increase from August 2012 (Source: Facebook)
1.09 billion people log onto Facebook daily (DAU) for March 2016, which represents a 16% increase year over year (Source: Facebook as 4/27/16) The Implication: A huge and vastly growing number of Facebook users are active and consistent in their visits to the site, making them a promising audience for your marketing efforts.
There are 1.51 billion mobile active users (MAU) for March 2016 (Source: Facebook as of 4/27/16) an increase of 21 percent year-over-year.
On average, the Like and Share Buttons are viewed across almost 10 million websites daily. (Source: Facebook as of 10/2/2014)