<% unless current_user %>   
  <%= link_to "Sign in with Facebook", user_facebook_omniauth_authorize_path %>
  <%= link_to "Sign in with Google", user_google_oauth2_omniauth_authorize_path %>
  <%= link_to "Sign in with LinkedIn", user_linkedin_omniauth_authorize_path %>
<% else %>  <%= current_user[:name] %>  
  <%= link_to "Logout", destroy_user_session_path, method: :delete %>
<% end %>
