At this point, the board of directors should just demand deletion of his Twitter account. I admire Elon for his vision, and actually also admire his radical style despite of its unpopular image - I watched the video where he smoked pot on the radio show. It was a really amazing conversation about future of humanity. He just needs to stop tweeting. You may say it’s fixing the symptom, but here if we take Twitter away,…
...Can a corporation demand an employee waive their right to speech as a private citizen? I think even if so, that's a terrible idea.
> Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; or abridging the freedom of speech,
A civil contract between a company and individual does not fall under this at all. They could add anything to that contract and it is up to you whether you sign it. If a company demands you to walk to the office like someone out of Monthy Python's Ministry Of Silly Walks, they sure can. It's up to you whether you accept it. There are some explicit limitations to this (class discrimination, whistleblower protections etc) but beyond that, it's a free country.