Over the past weekend, a P.R. firm called The Social Co. hosted a group of fashion journalists and bloggers for a gratis getaway at the Maidstone, an East Hampton hotel where mid-priced rooms go for $845 per night. Among the attendees was David Yi, a staff reporter at Condé Nast’s Women’s Wear Daily, who meticulously Instagrammed the entire weekend with the The Social Co.’s preferred hashtag, #MaidstoneVoyage. Now Yi’s employer is scrutinizing his attendance for a potential ethics breach.