What? The core aspect of FB/Twitter/etc. is twofold

1. No guaranteed-attention obligation from your circle, so you're free to share more things

2. Algorithms for YOUR attention so you see what you want to see in the order of importance. If you have very little time, you only see the most important things.

Email, Slack etc. are not even in the same category, it's like comparing a postcard to a newspaper headline

Grossly underestimates how complicated email can really be.