"Facebook is an American company. Since when did any American ever use the term "advert"? Seriously, Americans do not say this. The shortened form of "advertisement" in the U.S. is "ad," not "advert." Any claim otherwise makes me want to see the actual text of the original email, if one did indeed exist. Furthermore, companies do not let random employees write emails about corporate policy and send them out without having them reviewed and vetted for language. This sounds like someone (from the UK) is using the press to hype up his own business at Facebook's expense."