It was reported this week by The Information that Reuters would become one of the last free news services to implement a paywall. “The current plan... envisions putting all articles coming from specific coverage areas—such as energy, sustainability and its opinion content Breaking Views—behind a paywall by next February,” the site wrote.   Then today Folio: reported that Skift, the B2B media company serving the travel industry, just launched a digital paywall called “Skift Pro,” an annual product priced at $365 per year or $595 for two years.   A report came out last year from the Shorenstein Center at Harvard and Lenfest Institute titled, How Today's News Publishers Can Use Data, Best Practices, and Test-And-Learn Tactics to Build Better Pay-Meters.   (Matt Skibinski from the Lenfest Institute will be delivering a webinar for us on July 23 titled Understanding Editorial Economics an ...