> Corporate communication is corporate property and fully accessible as it pertains to investigations of corporate wrong-doing.

I guess it depends on your definition of corporate wrong-doing. If Elon just looked for all posts that include his name and he's firing everyone who was critical of him, that might stretch the definition for most people. That could even cross over into creepy big-brother like oversight and might dissuade people from working at Elon led companies (or maybe attracts people who want him searching their private messages for references to him).