Publishers Weekly: In a promotion tied to release of the film adaptation of “Insurgent,” HarperCollins is working with Twitter to offer fans of Veronica Roth’s “Divergent” trilogy a chance to buy a hardcover of the “Insurgent” movie tie-in edition at a 35% discount. HarperCollins is working with Twitter Commerce, the social media platform’s effort to offer “native commerce,” or offering firms the ability to send out tweets with buy buttons embedded in them.