J. Nathan Matias is a user on octodon.social. You can follow them or interact with them if you have an account anywhere in the fediverse.
If you don't, you can sign up here.
.@ethanz writes about Mastodon's popularity as part of a wider report with Chelsea Barabas and Neha Narula on decentralized publishing:
https://medium.com/@EthanZ/mastodon-is-big-in-japan-the-reason-why-is-uncomfortable-684c036498e5
