Instagram has shown us the mobile-first model, and I think it looks pretty good!
"Is it compelling?"
Compelling to what? Action? Consumption? Not sure what you're really asking.
It seems like we're moving to a point where mobile-centric as well as desktop-centric apps are designed from the beginning to look (and sometimes function ;) well in both domains. Cause how can you honestly create something today and never think "what will this look like on a phone?" while you're building?