What is a "content source" exactly?
When a source is added to your content list in your Paper Settings, Paper.li will automatically pull in any articles, images or videos pulled from that source.
In many cases, a "content source" is simply a social media account such as a user from Twitter, a Facebook group or page, or a Youtube channel. A content source might also be a group of users together, such as a Twitter list. In these examples, each time the users of the service share content on the social media channel, Paper.li pulls the content automatically into your paper in a readable format!
Other kinds of sources include an RSS feed which pulls in any new content posted on a particular website you follow or our own Genius Source which pulls in content based on keywords found within the millions of articles we pull in daily.