Mark Zuckerberg says weak US response to 2016 Russian election interference sent a signal to the world, and similar activity has increased from Iran and others (Salvador Rodriguez/CNBC)

Salvador Rodriguez / CNBC:
Mark Zuckerberg says weak US response to 2016 Russian election interference sent a signal to the world, and similar activity has increased from Iran and others  —  KEY POINTS  — Facebook CEO Mark Zuckerberg said the U.S.'s weak response to 2016 Russian election interference has inspired …