app/views/spree/shared/_social.html.erb
<div id="social-signin-links">
<% if (!spree_current_user || !spree_current_user.user_authentications) && Spree::AuthenticationMethod.active_authentication_methods? %>
<h2><%= I18n.t('spree.sign_in_through_one_of_these_services') %></h2>
<% end %>
<% Spree::AuthenticationMethod.available_for(spree_current_user).each do |method| %>
<% if method.active %>
<%= form_tag(spree.send("spree_user_#{method.provider}_omniauth_authorize_path", r: rand), method: 'post') do %>
<%= button_tag(type: 'submit', title: t('spree.sign_in_with', provider: method.provider)) do %>
<%= content_tag(:i, '', class: "icon-spree-#{method.provider.dasherize}-circled") %>
<% end %>
<% end %>
<% end %>
<% end %>
</div>