Ask DN: what are the rules as regards content extraction?

almost 6 years ago from , Dev/everygood.co

I have been using a personal experiment to follow up on article links shared on my Twitter timeline. To make it distraction free, the article content is extracted from the site and displayed within the web app. Are there rules against this? Pocket, Instapaper and related apps do this (i.e extract website content) already but I just want to be sure I'm not missing anything.