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I've been using black thumbs up until now without realizing it's a racial thing... and I'm white.

are you telling me I've been offending people?

Depends where you work. Personally, I will think it is odd, then move on. But your HR department may have a different view.

If it is a personal slack, then have fun!

I'm a big fan of the rainbow thumbs up because I like rainbows.