If there's a thing that Mastodon NEEDs fixing to be more "average user" friendly is the fact that if you click on a tag posted by someone from another instance, you are redirected to said instance.
This is going to be very confusing for the average non tech savvy user.
"Why can't I follow this person? Why am I not logged in?"
I'm no programmer, so I may be completely wrong, but I believe this shouldn't be hard to fix