@xtaldave BTW, I'll take down some notes here since I'm on the way: I have not used Twitter extensively, I had an account and maybe used it a couple of weeks so I don't know very well how that works.
What I've noticed in these two twitter migrations is that people using Twitter behave very differently from Mastodon users.
First of all it's very common for past twitter users to use their own full name and to have a picture of themselves; this is extremely rare on Mastodon and it's generally done by artists trying to sponsor their works and such things.
Moreover, twitter users use a huge amount of hashtags within their text, I had already written about this in the past; older Mastodon users generally add at most a couple hashtags at the beginning or at the end of the toot and very rarely mixed within the text.
What I've noticed from the first Twitter migration is that these behaviors disappeared after a while, not sure if that's because Twitter users integrated in the Mastodon culture or just stopped using it altogether.