It just keeps on spinning. I tried turning it off and on again with different connections.
I’ve received the spinning roundabout a few times, not sure if it’s just due to server load.
Edit: Posting this comment took 2 minutes.
If it’s spinning, it’s working on something. Chances are the post was created. Check back in a minute if it’s there.
Sometimes it’s just a visual glitch.
In the next time try to click in send and wait 2 to 3 minutes, then check the community (or click to see your posts in your account page) to see if the post is there.