EveryBlock, a hyperlocal website built on the promise of drawing customers with neighborhood-based news, wrote its own obituary on Thursday. "We're sorry to report that EveryBlock has closed its doors," said a blog posting on the site, owned by NBC News, part of the Comcast media group. "It's no secret that the news industry is in the midst of a massive change. Within the world of neighborhood news there's an exciting pace of innovation yet increasing challenges to building a profitable business," it said.