Eugen is a user on mastodon.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.
In terms of recreating the web Twitter experience, halcyon.social is pretty spot on (it's a webapp, not an instance!)
@Gargron I joined halcyon.social and looks so similar.
It's incredulous.
@Gargron holy mother of hell. That's insane! He's replicated it down to a T!
@Gargron please can we look at a share from Instagram to Mastodon Tab?
@Gargron Wow, is it close. It even changes the check mark emoji so that it looks more like the "verified" icon!
@Gargron WHOA