Rails 4 Data Toggle link_to

<%= link_to 'my site', 'mysite.example.com', { :class => 'tooltips', 'data-toggle' => 'tooltip', 'data-placement' => 'top', :title => '', 'data-original-title' => 'Facebook' } %>

Or

<%= link_to 'my site', root_path, class: 'tooltips', title: '', data: { toggle: 'tooltip', placement: 'top', original_title: 'Facebook' } %>

Or

<%= link_to 'my site', { controller: 'home', action: 'index' }, { class: 'tooltips', title: '', data: { toggle: 'tooltip', placement: 'top', original_title: 'Facebook' } } %>