In the last month, the world's largest social network has lost 6m US visitors, a 4% fall, according to analysis firm SocialBakers. In the UK, 1.4m fewer users checked in last month, a fall of 4.5%. The declines are sustained. In the last six months, Facebook has lost nearly 9m monthly visitors in the US and 2m in the UK.
Users are also switching off in Canada, Spain, France, Germany and Japan, where Facebook has some of its biggest followings. A spokeswoman for Facebook declined to comment.
Facebook is still growing fast in South America: monthly visitors in Brazil were up 6% in the last month to 70m , according to SocialBakers, whose information is used by Facebook advertisers, while India has seen a 4% rise to 64m – still a fraction of the country's population, leaving room for further growth.