1. Facebook chat is a mixture of exceedingly useful (if slightly creepy) features such as granular read notifications, but lacks the ability to mention a particular person in a group chat. In some ways, IRC is still way ahead in terms of these microinteractions and small feedback loops.

  2. When people drop into your IRC channel to ask whether it’s possible to reply to something on your mailing list, that’s probably a good sign you should ditch your mailing list and use IRC + Wiki.