It integrates very well with sites like Twitter and other news sites and has got browser extensions as well that helps you save articles to your account. Pocket is a free service available almost everywhere, it has clients for OSX, Android and iOS, the good part of using its apps is the offline reading feature.
Pocket has free apps for OSX, Android and iOS allowing you to read saved articles offline without internet connection with free web version.Once you save an article in Pocket, it gets downloaded to your device in which you are using the client and you can read the full article offline with no internet. You can easily organise your articles with tags and once you are done reading, you can archive the article for future references or if you think you are done with the article you can easily delete it. It is very easy to save articles from other news readers as well such as feedly, Flipboard and so on, so if you don't have an account you are missing out the best reading experience so just follow the via link below and create your pocket account for free.