Washington (AFP) – Twitter whistleblower Peiter Zatko told the US Congress Tuesday that the platform ignored his security concerns, with his testimony coming as company shareholders greenlit Elon Musk’s $44 billion takeover deal. The shareholder decision clears the way for the contract to close, even as billionaire Musk tries to exit it. Twitter has sued him to force it through, but analysts said testimony by Zatko, the social network’s former security chief, will put more pressure on the company as it heads to court next month. “I’m here today because Twitter leadership is misleading the publ…