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    <p>This question is addressed in the <a href="http://docs.angularjs.org/misc/faq" rel="nofollow noreferrer">AngularJS FAQ</a> quoted here:</p> <blockquote> <p>Occasionally there are pieces of data that you want to make global to the whole app. For these, you <strong>can inject $rootScope</strong> and set values on it like any other scope. Since the scopes inherit from the root scope, these values will be available to the expressions attached to directives like ng-show just like values on your local $scope.</p> </blockquote> <p>It seems that the team does encourage using <code>$rootScope</code> this way, with this caveat:</p> <blockquote> <p>Of course, global state sucks and you should use $rootScope sparingly, like you would (hopefully) use with global variables in any language. In particular, don't use it for code, only data. If you're tempted to put a function on $rootScope, it's almost always better to put it in a service that can be injected where it's needed, and more easily tested.</p> <p>Conversely, don't create a service whose only purpose in life is to store and return bits of data.</p> </blockquote> <p>This does not put too much load on the <code>$digest</code> cycle (which implements basic dirty checking to test for data mutation) and this is not an odd way to do things.</p> <p><strong>EDIT:</strong> For more details on performance, see this answer from Misko (AngularJS dev) here on SO: <a href="https://stackoverflow.com/questions/9682092/angularjs-how-does-databinding-work/9693933#9693933">How does data binding work in AngularJS?</a> Specifically note the section on performance. </p>
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    1. POAngularJS using $rootScope as a data store
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    1. COsince he already has the service, and since part of its job is also to manage the API (not just to store and return), that seems to argue against using the $rootScope in this case.
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    2. COPersonally, I prefer to keep data off of `$rootScope` but here is the endorsement from the FAQ. So since there are no real concerns with using `$rootScope` this way, it comes down to programmer preference and what makes the most sense in any given app.
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    3. COThank you all for your input!
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