app/views/sessions/_signup.html.haml
%ul.sign-up-buttons
%li
%a.button{:href => link_github_path}
.signin.github
Sign in via GitHub
%li
%a.button{:href => link_twitter_path}
.signin.twitter
Sign in via Twitter
%li
%a.button{:href => link_linkedin_path}
.signin.linkedin
Sign in via Linkedin