well… i used the twitter functionality: https://dev.twitter.com/web/embedded-timelines and created a html-file with a auto-reload time of 30 seconds and let this page show in an i-frame at my magic mirror…so it shows alle tweets in the right order and updates itself every 30 seconds–> http://vimsi.de/test.html

And does new tweets show on top or underneath the old one?
Which RSS plugin do you use?