Testing the webmention rocks!
I had a problem, where my site couldn't authorize with Twitter. Because of the lack of error messages in this part of the site, I couldn't what the problem was. So I added logging of error messages. The url of my website wasn't registered as a callback for Twitter. I added the url in the Twitter developer dashboard for my app and now the Twitter integration works again.
With the latest version of my reader I can follow feeds from other feeds. Ekster supports the search command with the url of a website. It suggests available feeds from that website. My reader shows preview and follow buttons and a way to select the channel I want to add the feed to. This lets me follow websites based on the likes posted by other people.