app/views/shared/header/_login.html.erb
<div id="auth_login" class="pull-right">
<% if logged_in? %>
<img src="<%= current_user.avatar %>" id="avatar" class="img-circle" />
<P>Logged in as <%= current_user %> | <%= link_to "Logout", "/logout" %></p>
<% else %>
Log in with:
<%= image_tag "twitter_64.png", size: "32x32", alt: "Twitter", id: "twitter-login" %>
<a href="/auth/facebook" class="auth_provider">
<%= image_tag "facebook_64.png", size: "32x32", alt: "Facebook" %>
</a>
<a href="/auth/google_oauth2" class="auth_provider">
<%= image_tag "google_apps_64.png", size: "32x32", alt: "Google" %>
</a>
<% end %>
</div>