Instapaper reviews saved articles and generates clean text ready to be read through their app using natural language processing

Solution:

The Diffbot approach is unique in that it relies on computer-vision techniques (in conjunction with machine learning, NLP, DOM inspection) as the primary engine in identifying the proper content to extract from a page. What this means: when analyzing a web document, our system renders the page fully, as it appears in a browser -- including images, CSS, even Ajax-delivered content.

Diffbot works very well on non-English pages, since visual structure of a page tends to be similar regardless of a page's written language.