News sites that install the Facebook Like button or the company’s other sharing plugins see increases in traffic and engagement, according to stats provided to Danny Sullivan at Search Engine Land. Facebook says a news site’s referral traffic triples on average after Facebook integration. Huffington Post readers who sign in via Facebook read 22 percent more pages and visit 8 minutes longer than the average reader. And users who come to NHL.com via Facebook log at least 85 percent more time on site, articles read and videos watched. The stats do not include specific time periods, source material or methodology, but they’re interesting claims.