code: function(stream, post) {
    this._credentials = [];
    this._status      = {};
    this._modules = {
      stream:   stream   || Stream,
      post:     post     || Post
    };
  }
docs: Service
  Manages all interactions with a social media service API, including streams, tracking info, etc.
  This is a parent class template, meant to be inherited.
  @constructor