It doesn't even ask for your first or last name when you sign up.
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Facebook bought Miller's company Branch for about $15 million in January.
Branch allowed Twitter users to more easily have small discussions.
Miller said at the time he was joining the giant social network with the goal of building Branch at Facebook scale.
With Rooms, people can be as public or as private as they want.
"We want to give people flexibility because that's what they want."Rooms, Miller added, is planning Android and desktop versions.
Though social networking sites like Facebook and My Space have come under fire in recent years as havens for sexual predators, incidents of predators actually contacting teens through these sites are less prevalent than media reports might suggest, according to a study released this week.
Facebook is going after those conversations as competition heats up with Twitter over digital advertising dollars.
Earlier this year, Facebook rolled out Twitter-like "trending" topics that show popular stories on the site.
That's a major departure for Facebook, which has always insisted that people use their real names.
Rooms is the latest mobile app to emerge from Facebook's Creative Labs.
They can even use emoji to create their own "like" buttons.