In November, three senior executives responsible for overseeing security, privacy and compliance resigned from Twitter, a day before a deadline for Twitter to submit a response to an F.T.C. demand letter. The F.T.C., in an effort led by Reenah Kim, a longtime staff attorney who was involved in the agency’s earlier investigation of privacy issues at Facebook, has spoken with at least two of those executives, Damien Kieran and Lea Kissner, three people familiar with the matter said.Mr. Musk’s mass layoffs have roiled the company’s legal department, which has drawn in support and lawyers from Mr. Musk’s other companies including the electronic car manufacturer T …
