[doorgunner69]

Different tap patterns can be used to distinguish between, say, a Twitter notification

Are there truly airheads out there that need/want this sort of stuff?

[kevkrom]

You can replace “Twitter” with any other kind of notification, say, an alert from your home security system or an email arrives from a contact designated as “VIP”. It was meant to be illustrative, not the be-all and end-all of the technology.