erb/layouts/_footer.html.erb
<nav class="icons">
<%= link_to image_tag("icons/facebook_icon.png"),
"https://www.facebook.com/calraijintaiko", :target => "_blank" %>
<%= link_to image_tag("icons/instagram_icon.png"),
"http://www.instagram.com/calraijintaiko", :target => "_blank" %>
<%= link_to image_tag("icons/youtube_icon.png"),
"https://www.youtube.com/user/CALtaiko", :target => "_blank" %>
</nav>