Here are a few thoughts and wishes for ux:
Don't force us to go back to the original post to reply.
Instead of a mouse-click, use a key combo to execute "Post" or "Reply"—maybe alt/option + Return.
Make the font size adjustable. Old people use the Web, too.
Make it possible to change the font. (webfonts maybe?)
Let us change the page background color so that the stark B&W doesn't poke out your eyes at night.
Threaded replies read in the wrong order. Reading from the bottom up in a thread is weird.
Posting via iPhone doesn't work. The "Post" button is there, but it refuses to let itself be clicked.
Thanks for making ello.