It´s the culture of "poison & antidote". The industry follow the idea that people want to be each time more selfish, consumist and imediatist.. and create devices to support it, thinking only in the profit. Sad.

surely this is a joke?

I don't think it's a joke, but letting the extension post that you're too drunk to be posting pretty much defeats the purpose. Nice one.

If you use Gmail, there's a similar toy in their Labs (experimental extensions).

It's called "Mail Goggles" and pops up with a similar sobriety test at user-specified hours of the day before letting you send an email. In their case the test is a set of easy (or not-so-easy) maths questions.

This needs to be mandatory!