Snapchat with 100mn+ monthly active users (no exact figures available in the market) experiments with "Snapchat discover", a feature that brings you stories from National Geographic, Vice, Comedy Central and others. THere's an interesting quote in their announcement - do they really mean it or is it because they don't have the features to implement?
"Social media companies tell us what to read based on what's most recent or most popular. We see it differently. We count on editors and artists, not clicks and shares, to determine what's important"
Some insight: http://mashable.com/2015/01/27/snapchat-discover/
Original post by Snapchat: