It appears to be an iteration of his previous app Trimit: http://www.fastcompany.com/1772823/the-15-year-old-brain-beh... http://techcrunch.com/2011/07/15/trimit-summarizes-emails-bl...

I am guessing that he just outsourced the AI/algorithm part based on the articles content: 'we' and 'The Trimit team' and Nick just designed the UI. Overall, great concept, but poor execution (in terms of accuracy) and journalists seem to be buying the hype.