Facebook’s troubles entered a fourth day with a rising chorus of people – including the co-founder of WhatsApp – joining the #DeleteFacebook movement as the Federal Trade Commission was reported to be investigating the company’s handling of personal data. See: How to permanently delete Facebook Account Momentum gathered behind the #DeleteFacebook campaign, with several media outlets publishing guides to permanently deleting your Facebook account. One surprising voice to emerge was that of Brian Acton, the co-founder of WhatsApp, which was bought by Facebook for $19bn in 2014 . Acton, who left WhatsApp in late 2017, posted to Twitter: “It is time. #deletefacebook.” The backlash has spooked investors, leading shares in the company to fall by more than 9% over the last two days – wiping almost $50bn off the valuation of the company. Read also: How to deactivate Facebook Account Temporarily Meanwhile, in the United States, the FTC will examine whether t...