Intro to the big 3 (Facebook, Instagram and Twitter)

Facebook. Surely you've heard of it.  According to Statista. "As of the fourth quarter of 2017, Facebook had 2.2 billion monthly active users. In the third quarter of 2012, the number of active Facebook users had surpassed 1 billion, making it the first social network ever to do so. Active users are those which have logged in to Facebook during the last 30 days." …