{% load likes_book from social_tags %}
{% likes_book book as likes %}
<div class="star {% if not likes %}un{% endif %}like">
  <div class="if-like" >
    <a id="social-book-sets-{{ book.slug }}" data-callback='social-book-sets'
       class='ajaxable' href='{% url "social_book_sets" book.slug %}'>★</a>
  </div>
  <div class="if-unlike">
    <form id="social-like-book-{{ book.slug }}"
          data-callback='social-like-book' method='post'
          class='ajax-form' action='{% url "social_like_book" book.slug %}'>
      {% csrf_token %}
      <button type='submit'>☆</button>
    </form>
  </div>
</div>