This reminds me, a few months ago, a "real-time" chat app appeared on HN which would display your typing to a public chat room before you hit Enter. And people found ways to inject XSS into usernames, including images and JS popups. Does anyone remember the name and URL of the site? I think it would make an intriguing alternative to voice calls, which is more synchronous/immediate/interactive than a conventional IM app where the other person can only start reading a sentence once you've finished typing it.