Hmmm, 1.6B do what exactly? Scrolling mindlessly through algorithm-curated feed that ensure users always got the right amount to dopamine to keep them scrolling for hours? Look around you, people that glue to their screen all the time without realized they are being engineered to do what Facebook want them to do, is that really actually good for society?
Don't get me wrong, I use Facebook once in a while to keep in touch with my friends, and in rare occurrence I even feel "Damn, I'm thankful that Facebook exist" I can see the good in them, but the problem they cause to society cannot be denied. The witch hunt, the cyberbully, the echo chambers, the life's hilight showreel effect, the "do whatever in order to get the Like", etc. (Ugh, I need two A4 to list them all!) These problems may existed since the dawn of internet, but it is amplified by social media, and many of them pioneered by Facebook.