A while back I had a long design discussion about using IFTTT to do essentially what pagerduty is doing. Notification relays and routing: Feed an event into it, and based on urgency and tags broadcast it to the correct feeds (irc channels, slack, email sysadmins, etc). You could theoretically create groups of people you want to contact this way.

No more screwing around with bridging protocols and every single bot implementing their own library to connect to a billion different messaging protocols.

But yeah, I'm not passionate enough about the idea to do it. And IFTTT wouldn't have been enough.