Say you (involuntary) started an SMS or email avalanche with some friends. Why not have a site with a very simple chat. No usr/pwd and no functionality; if you know the URL you can get to participate.
The chat is erased after a few days.
But in that time the participants have sorted out where to meet and who brings what and the SMSes/email flood can trickle down to a more manageable level.
“hey everyone – information overlaod – please continue the discussion on http://bachelor.chat.ninja”
The GUI code is reduced to as few bytes as possible to load blazingly fast on mobile devices.