Another massive benefit of the Mastodon<->Twitter mirroring sites is that when you search for a friend on Mastadon, 3 different profiles for them show up and it's not clear which one is them 'on mastodon'

I put that gem in my book of glorious UX behaviors Mastodon has, right next to painfully navigating to another user's profile and seeing 'Posts from other servers are not displayed. Browse more on the original profile' only to be brought to a different site with a different layout and theme.