There a lot of people I follow on Twitter who value their anonymity, like https://twitter.com/pseudoerasmus, and being able to see them debate others real-time about issues of substance is valuable to me.
Some other examples of recent, useful tweets:
https://twitter.com/TheStalwart/status/775038793376231424
https://twitter.com/cblatts/status/685580497859252224
Twitter encourages interactivity in way that Facebook does not (though that might have more to due with the existing userbase than the UX), and it's text-focused in a way that Instagram, Snapchat, etc., are not.