For marketers, Facebook is the 800-pound gorilla in the room. The Pew Research Center says that nearly 80% of Americans who are online use Facebook, more than twice the number who use Twitter, Instagram, Pinterest or LinkedIn. Facebook users are also highly engaged, with more than three-quarters of them visiting the site daily and over half logging in multiple times per day. The number of active monthly Facebook users worldwide stands at approximately 2 billion. But for marketers, the most important Facebook statistics may be this: Users spend an average of 35 minutes a day on the social media platform.