Great write-up Léo and Jen! You have deployed a great vision, and we can only hope that Slack shares it. They have nailed collaboration within teams, but collaboration across teams remains difficult. At Smooz.io I want to facilitate collaboration between clients and agencies across team. Sharing files and meeting action plans is a key feature (great comment Nils btw!).
I just feel like we are several sharing your vision… Another interesting example is Sensay, to leverage expertise across all silos/platforms. And if at Kifi you can leverage your network for sharing interesting content, you could be a Digg/Reddit of the chat age…!