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FYI, you should never hack the WordPress core files. Instead, WordPress provides the handy rss2_item action hook. All we need to do is check if we're on a category feed or not: function wpse_99336_category_feed_item() { if ( is_category() && get_the_post_thumbnail() ) { printf ( '<featured-item>%s</featured-item>', ...


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It is very likely because you are using the old Twitter API, for example: <script type="text/javascript" src="http://twitter.com/statuses/user_timeline/USERNAME.json?callback=twitterCallback2&amp;count=4"> You will need to update your code to the new API: ...


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For terms and taxonomies use get_term_feed_link: "Returns a link to the feed for all posts in a given term. A specific feed can be requested or left blank to get the default feed." See also get_tag_feed_link and get_category_feed_link. For post types see get_post_type_archive_feed_link. These functions are located in in ...



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