NextStop, a cool site that let folks share information about local things to do–and which had a particularly slick HTML5 interface–has been bought by Facebook. As is often the case when big Web companies buy little Web companies, the news isn’t great for fans of the little company. Facebook wanted NextStop’s talent, not its creation: The site is now open only to registered members, and will close altogether on September 1st. At least NextStop isn’t whitewashing the situation–and it’s letting users export content they’ve created and is releasing everything under a Creative Commons license in hopes that it doesn’t disappear altogether.