Add the following to your form template (probably below the {% endblock content %} block):

{% block script_extra %}
  {{ block.super }}
  {% include 'base/_facebook.html' %}
{% endblock script_extra %}

Browse to the Facebook Social Plugins, Like Box page:

Replace the Facebook Page URL with the URL of your Facebook page.

Tick Show Posts

Modify the other settings as required.

Click the Get Code button:

Put the second bit of code (where it starts with <div class="fb-like-box") into your template where you want the feed to appear.