This feature reminds me of diffbot (diffbot.com). I met one of the co-founders (who's out of Stanford) and his demo worked very well. He was using it to check u

This feature reminds me of diffbot (diffbot.com). I met one of the co-founders (who's out of Stanford) and his demo worked very well. He was using it to check updates on course webpages, for example, so this feature isn't new. It also has some neat uses cases for financial companies tracking lots small snippets of new info.