This setting:

Settings shortcut: Theme management > Highlight color

It changes the color of some elements. Mainly the community names.

It’s nice to have the same settings for different profiles, but I set a different highlight colour to differentiate them.

But you can sign up to as many instances as you like with the same username and email.

But, like anywhere else, I would strongly suggest to use different passwords.

I don’t know about that. I use Mastodon almost exactly like I was using Twitter.

I’m on a smallish instance (around 2K accounts), and I don’t have trouble finding interesting stuff.

Mastodon definitely isn’t built or designed for one-in-one conversations.

It’s a microblogging platform for diffusing content, opinions or anything else people want to use it for, somewhat like Twitter, with some variations.

I don’t really use it, but I noticed that they just launched a new version. https://wts2.wt.social