Sure @oldtimer, just some quick napkin math based on some stats that were in his post:

Back in 2015, it was stated that graphene-based blockchains (this was referring to Bitshares specifically which Steem was originally based on) was able to handle up to 18,000 transactions per second on a distributed network.

That's roughly 1.5 billion transactions per day. Twitter currently handles about 500 million tweets per day according to their statistics page.

These were stats from 2015, it is now 2019 and Steem has continued to evolve. Along with many other scaling challenges out of the way (such as MIRA to solve the ever-increasing RAM hardware issue that still plagues other graphene chains), I think we are very well positioned to bring in a mass amount of activity.

Further, Steem is an ongoing and very much alive project. As new challenges arise, those problems too will be tackled.