YGGtracker/templates/default/activity/event/user/add.rss.twig

<item>
    <title>{{ 'User' | trans }} #{{ user.id }} {{ 'have joined' | trans }}</title>
    <author>#{{ user.id }}</author>
    <pubDate>{{ added | date('D, d M Y h:i:s O') }}</pubDate>
    <guid>{{ url('user_info', { userId : user.id }) }}#activity-{{ id }}</guid>
    <link>{{ url('user_info', { userId : user.id }) }}#activity</link>
</item>