GNU social has always been a project dear to hackers.
And it's because we love the project history and nature of being easily extensible and capable of communicating with the most diverse platforms that we insist on implementing robust and expressive specifications.
Want the notes mentioning you showing up on your toasts, then just code a quick script and GNU social will definitely not be the one holding you back. We can think of this old GNU social <-> Arduino bridge.
Webhooks is thus one more natural step on this direction.