Elon Musk's recent comments insinuating that the real-time messaging service formerly known as Twitter could file a defamation lawsuit against the Anti-Defamation League is merely a "threat of a frivolous lawsuit," the nonprofit's CEO Jonathan Greenblatt said Tuesday. In a statement shared with CNBC, Greenblatt dismissed allegations Musk made over the Labor Day weekend, in which he claimed the ADL was "trying to kill this platform by falsely accusing it & me of being anti-Semitic." The nonprofit's CEO added that Musk's "behavior is not just alarming nor reckless." "It is flat out dangerous and deeply irresponsible," Greenblatt said. "We need...