San Francisco, May 9: Mired in a massive data breach controversy, Facebook has reportedly rolled out biggest-ever shuffle at the senior management level since its inception — across platforms, including WhatsApp and Messenger. According to tech news website Recode, Facebook has made long-time executive Chris Cox in-charge of Facebook, Instagram, WhatsApp and Messenger — now called a “family of apps”. “Facebook is also building a new team dedicated to Blockchain technology. David Marcus, the executive in-charge of Facebook’s standalone messaging app, Messenger, is leaving that post to run the Blockchain group,” the report said late on Tuesday.