<span ng-if="!vm.user">
    <md-button class="md-fab md-mini" ng-click="vm.login('facebook')"><i class="fa fa-facebook"></i></md-button>
    <md-button class="md-fab md-mini" ng-click="vm.login('twitter')"><i class="fa fa-twitter"></i></md-button>
    <md-button class="md-fab md-mini" ng-click="vm.login('google')"><i class="fa fa-google"></i></md-button>
</span>

<span ng-if="vm.user">
    Hello {{vm.user.displayName}}!
    <md-button class="md-raised md-mini" ng-click="vm.logout()">Logout</md-button>
</span>
<span ng-if="!vm.user">
    <md-button aria-label="Login with Facebook" class="md-fab md-mini" ng-click="vm.login('facebook')">
        <i class="fa fa-facebook"></i>
    </md-button>

    <md-button aria-label="Login with Twitter" class="md-fab md-mini" ng-click="vm.login('twitter')">
        <i class="fa fa-twitter"></i>
    </md-button>

    <md-button aria-label="Login with Google" class="md-fab md-mini" ng-click="vm.login('google')">
        <i class="fa fa-google"></i>
    </md-button>
</span>

<span ng-if="vm.user">
    Hello {{vm.user.displayName}}!
    <md-button class="md-raised md-mini" ng-click="vm.logout()">Logout</md-button>
</span>
Add aria-labels to login buttons.
Add aria-labels to login buttons.
