What’s this beautiful font?

And how would for example “mastodon.social” learn about my instance and show my toots to their users? Should someone from “mastodon.social” to search for me explicitly?

I use Manjaro ARM on my Orange PI because I couldn’t get Arch ARM to work on it, while Manjaro has support of my devices out of the box. Since I installed a minimal possible version (without any DE), it doesn’t feel bloated or something. It feels like I’m using Arch but with slower updates. Overall, it’s good and I don’t notice much difference from Arch. But anyway, I haven’t tried it for a desktop station.