Added info for social shares

docs/features.rst

@@ -201,3 +201,47 @@ To add the blog Sitemap, add the following code to the project ``urls.py``::
             }
         }),
     )
+
+
+*************
+Social shares
+*************
+
+``djangocms_blog`` integrates well with options for social shares. One of the many options available is [Shariff](https://github.com/heiseonline/shariff) which was developed by a popular German computer magazine.
+
+To allow readers to share articles on Facebook, Twitter, LinkedIn or just mail them, simply add share buttons to your ``post_detail.html`` template just before ``</article>``. 
+
+If you decide to use Shariff this just requires a simple ``<div>`` to be added (see documentation of shariff). Here is a simple template tag that loads all required conifigurations and javascript files. The ``<div>`` becomes ``{% shariff %}``:
+
+    from django.conf import settings
+    from django import template
+
+    register = template.Library()
+
+    @register.inclusion_tag('djangocms_blog/shariff.html', takes_context=True)
+    def shariff(context, title=None, services=None, orientation=None):
+        context['orientation'] = orientation if orientation else 'horizontal'
+        context['services'] = escape(services if services else
+                                    settings.SHARIFF['services'])  # MUST be configured in settings.py
+        if title:
+            context['short_message'] = settings.SHARIFF.get('prefix', '') + title +\
+                          settings.SHARIFF.get('postfix', '')
+        if 'mail-url' in settings.SHARIFF:
+            context['mail_url'] = settings.SHARIFF['mail-url']
+        return(context)
+
+And in ``templates/djangocms_blog/shariff.html`` you simply need
+
+    {% load static sekizai_tags %}
+    {% addtoblock 'js' %}<script src="{% static 'js/shariff.min.js' %}"></script>{% endaddtoblock %}
+    {% addtoblock 'css' %}<link href="{% static 'css/shariff.min.css' %}" rel="stylesheet">{% endaddtoblock %}
+    <div class="shariff" data-services="{{services}}" data-orientation="{{orientation}}"{% if mail_url %} data-mail-url="{{mail_url}}"{% endif %}{% if short_message %} data-title="{{short_message}}"{% endif %}></div>
+
+The shariff files ``js/shariff.min.js `` and ``css/shariff.min.css`` will need to be added to your static files. Also, a little configuration in ``settings.py`` is needed, e.g.,
+
+    SHARIFF = {
+        'services': '["twitter", "facebook", "googleplus", "linkedin", "xing", "mail"]',
+        'mail-url': 'mailto:',                  # optional 
+        'prefix':   'Have you seen this: "',	# optional
+        'postfix':  '"',                        # optional
+    }