> sending a tweet is a lot like emailing to a group of followers. (Though it's unlikely they implement it that way because of the number of tweets that go unrea

> sending a tweet is a lot like emailing to a group of followers. (Though it's unlikely they implement it that way because of the number of tweets that go unread.) My understanding (from a watching a Twitter Tech talk, maybe about redis?) is that that is actually how it is (was) implemented. They were so focussed on time to first render, they took the efficiency hit.