Build an activity stream based on angular.js and firebase

We have an existing project that has been developed with [login to view URL] stack. We would like to integrate an activity stream based on firebase/angular.js. The module requirements are: - Modelization based on Activity Stream 1.0 - One public feed - One feed per user - feed created on user creation - real-time update with firebase and angularfire (user feed) - management on multiple feeds on crud operation; I update a user feed, to contains other user info, update their feed. - We should be able to integrate that module with other modules that would be develop later on so we will probably need to create a factory / service to manage all this. We need to structure, develop and integrate with the existing package ([login to view URL] package).