Those who are old enough might remember when “The Facebook” was a more exclusive club—one where only American college kids could post raucous party pix, browse through a crush’s public photo albums or track down childhood friends with a few clicks. Twenty years after the social media juggernaut’s launch, Facebook users can still do all that—except now they’re 40% of the world’s population.
Q&A: To like or not to like—Facebook at 20
