I just released v0.4.1 of mastodon.el.
New HTML rendering should fix new line issues, tag references (full URL vs #emacs), and handle references (full URL vs @johnson).
All URLs can be visited ENTER, including tags and handles, assuming you can access some kind of browser from your Emacs.
The mastodon-version function is fixed and actually works now.
When you boost/favourite a toot, a message lets you know it was successful.
@johnson
Emoji/non-ASCII character issues are not fixed by the HTML rendering. In fact, you might consider it worse. Just an FYI.
#emacs