This reminds me of that one time after working at a company for 4 months they informed me they were in a middle of an IP lawsuit which is part of the reason they hired me to rewrite the front end without knowing that was going on. That was f*(ked for reasons.

Whatever the case, the only time people look at your social media history is to look for attacks and the only reason they will look at a company's slack messages and emails are to look for attacks during discovery.

I would argue that company secrets are mostly useless for the company but very, very useful to other companies. For this reason, there should be retention policy of a day or two for almost all communication unless it is important, required by law, or documentation. And, definitely do not share that information with the public without good reason.