The investigations have also been expanded to look at what Facebook executives knew, when they knew it, and what they did in response, including their public statements.
Good luck. Any incriminating evidence is long gone, or moved where US investigators will never find it. These Keystone Kops couldn't find Hillary's email server, and it was only managed by a private contractor. Imagine the hurdles and holes that one of the world's top tech companies can generate to obfuscate and hide any data they don't want found.
Biting the hand that feeds IT
