That’s what WhatsApp founder Jan Koum told his investor, Jim Goetz, in a 2012 email. Koum referred to it as a “rumor” Zuckerberg heard, and that he worried Tencent would use the messaging app to compete with Facebook outside of China. “I told him I’ll let him know if we ever do get an offer we would ever consider,” Koum wrote about his interaction with Zuckerberg. “That made him feel better.”