The .WWF file format is a “green, because unprintable” file format, with its own website and Facebook page. On March 17 2011, around 10 am GMT +1, that Facebook page was updated with a post that starts saying: “Use WWFs tips on paper efficiency to help save the earth, reduce your carbon footprint and save money at the same time.” These tips include, according to that post on Facebook (the bold markup is mine):