Not entirely on topic with `#658 </issues/658>`_ or
`#659 </issues/659>`_, but related.

My expectation was for the atom feed to contain the thumbnail of
the image (or equivalent of other media types). This is important
to me, as I want to widgetize/aggregate the feed on other sites.

I found two places where feeds are generated,
``mediagoblin/user_pages/views.py`` and
``mediagoblin/listings/views.py``:

::

        for entry in cursor:
            feed.add(entry.get('title'),
                entry.get('description_html'),
                content_type='html',
                author=request.matchdict['user'],
                updated=entry.get('created'),
                url=entry.url_for_self(request.urlgen))

I am not sure what the thumbnail is, but I am betting it is a
**summary** or maybe **content** (see the
`werkzeug atom docs <http://werkzeug.pocoo.org/docs/contrib/atom/>`_).
I think this is important, even if we are moving to make it a full
ActivityStream, since the federation I have in mind is something
akin to a dashboard view of new photos posted on my friends'
sites.

So, can we get a thumbnail in there? =]

I see from `#362 </issues/362>`_, `#363 </issues/363>`_ and
`#410 </issues/410>`_ that a lot of effort was put into Markdown
support. And `#379 </issues/379>`_ demonstrates that the fields
have to be scrubbed anyhow. So, I am wondering if it is possible
allow/configure HTML in all the applicable fields.

Without getting into it, I use HTML, Textile and Markdown (and
various wiki syntaxes) habitually, but hardly anyone else I know
does. All my cool friends know how to create an anchor element in
HTML, though.

Of course white-listing elements is probably useful. I imagine that
this could be configured with overrides, but it is fairly simple to
find a reasonable default set of elements to allow.

Thoughts?