After fumbling into the world of social media with Google Plus, and then slowly retreating, Google is ready to try again, but this time the company is being much more cautious. Earlier this week, Google quietly released a new app called Who’s Down on the Play Store, which allows users to announce to the world that they’re free to hang out and do stuff, and then connects them with people who are in a similar position. It’s invite-only at the moment, and requires users to list what school they go to when signing up, so it’s clearly being aimed at younger demographics.