Unfortunately after I enter a word and press Enter I'm shown an 'Application Error' page.

Yeah, After posting to Hacker News, the web-app got serious traffic. Try refreshing, it'll work. Using, a free Heroku Web-App. That obstructs the traffic.

Same here, but will try again later :)

Curious, can you share much about how it works?

It's actually a variation of : http://www.ravikiranj.net/drupal/201205/code/machine-learnin... The ideology and process is same. I've used FLASK+BootStrap to handle the front-end+server.. PS: try this. it might work for some time. before this fails too(..if traffic increases) http://whatarepeoplesaying2.herokuapp.com/