Yes, I made a mastodon account recently, you can add me if you want there.
I don't know if you found my exact account because there are more people with the same username, this one is mine: https://mastodon.social/@kesk

So far I only installed mastodon preview feed onto my webpage.
I usually publish notes and posts from Obsidian.
I'm also interested into connecting Obsidian and Nostr to Mastodon, or posting from Obsidian to Mastodon.