You seem smart and knowledgeable. Maybe you should reach the lawyers at these companies and then they can change the policy!

No I think it's made up, there is no policy, and the lawyers couldn't care less, it's just something people do to massage their own ego.

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I can tell you firsthand, it's not made up. Wait, did I just brag in your opinion?

It is absolutely not made up, and yes, some companies absolutely do care.

Nope. I previously worked at a very big tech company (not Google) and they definitely had guidance like that in the social media policy.

Government definitely does too.