I don't know how it is in Slack, but in other apps if someone already thumb'd something up you have the option of just clicking their thumb to +1 it or you can go into the emoji picker and pick your favorite shade of thumb. Sometimes you do just want to +1 so you just click whatever is already there and that's when this awkward dance begins.

Once I noticed all my non-white colleagues had selected the closest skin tone, I selected the white one.

If I click a black or brown thumbs up in Slack to add my own, a white one is added.

We're a very small team and three of the skin tone choices are unique, so I often know who has reacted from the colour.

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