- write a better XSL stylesheet? I am not an XSL expert.
- evaluate the use of the <ttl/> RSS element.
- use the <enclosure/> element for pump.io media objects
-- use the <enclosure/> element for images on dilbert.com
+- show cards directly in RSS items for twitter.com
+- show direct links for videos in the Instagram feed
- check the encoding of the tweets when UTF is used,
maybe solvable with mb_convert_encoding()?
See http://php.net/manual/en/domdocument.loadhtml.php