One of the projects our team has been working is called “SharePlay” and it’s been reviewed by Tyler Treese at PlayStationLifeStyle.net
He’s right that not so many people know about this feature. They have generally heard of PlayStation Now and Remote Play, but not Share Play.
http://www.playstationlifestyle.net/2015/03/09/share-play-ps4s-best-feature-nobody-talking/#/slide/3