Johnston Press hit by Facebook and Google changes

(Reuters) - Britain's Johnston Press suffered a 10 percent drop in first-half revenue as changes to Google and Facebook's platforms hurt online advertising sales, sending the newspaper publisher's shares down by almost 12 percent.Though the company swung to a pretax profit, thanks largely to higher sales at "i" - the cut-price sister title of The Independent newspaper that went digital-only in 2016 - it is still grappling with a 220 million pound debt burden and sector-wide difficulties in..