Bit of a half-nag here, but before the SB's code upgrade, I was able to continue my chats with everyone into the wee hours via my iPhone (5s).
I don't know if the coding is very incompatible with mobile sites, but I've tried to no avail to get a post through.
I think if another upgrade is coming soon, this would be a recommended add as right now, you click on the submit button and no dice. Nothing happens.
It works flawlessly on my desktop setups so yay for that. ~Kai