Facebook requires a real name and most people provide it, because they also use it as a Friends & Family social network. We've also drilled into an entire gener

Facebook requires a real name and most people provide it, because they also use it as a Friends & Family social network. We've also drilled into an entire generation's heads that employers will check Facebook, so realistically most of the conversation on Facebook these days is either carefully groomed, or Tumblr-style Buzzfeed reposts, or personal updates scoped to friends & family. Twitter is intended to be public -- as private accounts vastly limit your audience, and at that point, you have much better alternatives to share content within your circle like Tumblr or Facebook or Instagram. You can adopt a pseudonymous identity, and most importantly, you can tag (ie. 'reply to') other public accounts, essentially arbitrary people.