The earliest major inflection point in Twitter's adoption was when
@aplusk
raced CNN to a million followers, and Oprah created her account. As of this week, the fediverse has 33% more active users than Twitter did at that point; Mastodon alone is larger. https://www.cnn.com/2009/TECH/04/17/ashton.cnn.twitter.battle/index.html
@SpinozasHeresy @anildash Although I had an account a few years before this, this was the event where I started actually finding myself using it. I remember my BIL getting updates about what was happening much earlier than the news coverage and with much more detail.