+- write better XSL stylesheets? I am not an XSL expert
+- evaluate the use of the <ttl/> RSS element
+- 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