I've been working on a new app.
The concept is simple: add a notification feed to your store, just like the one we're used to seeing on Facebook, Linkedin, etc.
You can check what it looks like here (the bell in the header).
We've already onboarded a few beta users (and noticed a pretty solid opt-in rate). But I'd like to get more Shopify experts to look at it to make sure we're headed in the right direction.
Please reply to this thread if you'd like to participate!