when it comes to co-workers, especially superiors. Keep it professional with them and limit your social media interaction with them to an absolute minimum.
No man, don't post anything. When work is involved you don't mess with it. Doesn't matter if it's serious or if it's a joke, you just don't mess around with work.
You're literally debating whether or not it's okay to "share" the Chaka Khan music video. Realize that both your worrying, and sharing of the video are trivial.
That's not a healthy mind state to be in. Social media is poison.