Ionic list not refreshed

ioniclist.html

// in my controller, the function executed when a tweet is received (this works, I verified by logging the tab)
function(e) {
  $scope.tweetStream.unshift(angular.fromJson(e.data))		
}

// in my view 

<ion-view view-title="Tweets">
	<ion-content>
		<div class="list">
				<h2 ng-repeat="entry in tweetStream">{{entry.name}} - {{entry.location}}</h2>
		</div>
	</ion-content>
</ion-view>