Who's Brian Acton, WhatsApp Co-founder who also funded WhatsApp rival Signal? 
WhatsApp Co-founder Brian Acton, who became a part of Facebook after Facebook's acquisition of WhatsApp in 2014, left Facebook in 2017 after rift with Facebook CEO Mark Zuckerberg over monetising WhatsApp. In February 2018, he launched the non-profit Signal Foundation and helped Signal messaging app with $50 million funding. In March 2018, Acton had tweeted, "It is time #deletefacebook."