Here's a story - or more properly, a rumor - for the folks who are never more than five feet from their iPhones and don't let a day go by without signing into Facebook: the next iPhone operating system will supposedly feature a certain level of integration with the social network. Dan Frommer wrote this afternoon, "Apple is building Facebook features into the latest version of its iPhone software, we're told by a plugged-in source in the mobile industry." Then,