scrambling, quite simply, to prevent the social media platform from collapsing, this after hundreds of vital employees quit. cbs jonathan vigliotti spoke with an engineer who was laid off. reporter: tonight, as questions mount over twitter s future, elon musk offered little reassurance he has a permanent plan tweeting, what should twitter do next? the culture at twitter under elon musk was definitely a culture of fear, of uncertainty, of anxiety. reporter: justine de caires worked for twitter for three years before being laid off, along with reportedly nearly half the staff earlier this month. de caires is part of a class action lawsuit against the company. will twitter s lights stay on? i ve seen systems start to fail already. and i expect to see smaller things break, and then slowly bigger things start to break, especially with all the expertise that went out the door yesterday. reporter: this week, musk gave remaining employees an ultimatum: pledge to be extremely hard