More of the Social Media AU: these chats here are happening during season 1. Note the icons at the top - the left overlaying one tells you who started the DM.

The Agni Kai button is an inherent feature of this social media site hosted by the Fire Nation, the only one in the world so unfortunately everyone's on FlameBlr(?) The button starts a chat battle that's livestreamed. That's not shown here but I heard Zhao is almost always live. Idk.

As many people said, all public posts are automatically deleted after 24 h to prevent flame wars getting out of control. It's a very toxic social media site!

Part 1

Part 2

Part 3

and this is part 4!