[runin2k1]

The same way that Spotify doesn't just ham-fistedly show you all your Facebook messages... and other apps don't show you messages intended for Spotify.

Presumably messages are tagged in such a way that the source and/or destination are intended for Spotify. Using that same system, you should be able to specify "Spotify can only read & write Spotify messages."

[chillacy]

That sounds like it would partition my messages, which is not what I want in a 3rd party messenger client.