Image Credit: Ben Scholzen/FlickrLinkedIn is exploring passive location updates reminiscent of Foursquare and Sonar, according to LinkedIn designers Mauroof Ahmed and Moses Ting. These experiments follow a series of moves from LinkedIn designed to boost engagement, including the acquisition of Newsle, the launch of redesigned Web profiles, and the debut of LinkedIn’s new Connected app, which prods you to stay in touch with your network.