social/social_media_tripadvisor/views/website_blog_template.xml

<?xml version="1.0" encoding="utf-8"?>
<openerp>
  <data>

    <template id="opt_blog_rc_follow_us_extra"
              name="Extra Social Links"
              inherit_id="website_blog.opt_blog_rc_follow_us">
      <xpath expr="//h2[@class='mt4']"
             position="after">

        <a t-att-href="website.social_tripadvisor"
           t-if="website.social_tripadvisor">
          <i class="fa fa-tripadvisor"></i>
        </a>

      </xpath>
    </template>

  </data>
</openerp>