Well you were first. You even got an image and twitter embed, but no replies. What a shame.
I don't understand how people are able to embed tweets. There was a function for it next to the gif upload icon, but it disappeared for me. How did it not disappear for others???
I think you have to manually paste in the embed code.
Hit the source button then type
<oembed>paste embed code</oembed>
Then press source again when you're done.