There are some applications like Readability and Pocket, which are letting users to read the main content of web pages, in a clean interface or such. But the articles should be bookmarked from another application, or the web browser.
However, I'm creating a news reader app (Zite and Flipboard are popular news reader apps), and I want to create a clean experience for users, so I want to show full content of articles inside my application. Some websites have fulltext feeds, and I'm using it.
But about some other websites, which don't have full text feeds: I want to know, is it legal/ethical to use for example Readability API (Or maybe writing my own code for this) to show full text of articles inside my application?