Local co-op and couch gaming are largely dead; a relic of the past because – certain party games excluded - it’s so seldom that people invite friends over to play video games. Instead, people now play video games with their friend over the internet. It’s a pity, not just because sitting with friends on a couch and playing video games together or against each other is awesome, but because there are so many games that don’t have online multiplayer support; games that would be better if played with others.

Sony explains how SharePlay works in the upcoming PlayStation4 update.