Experiment. I head someone say the Twitter algorithm is not racial, but features the smiling person over the non-smiling person. Let's test that. 
And here are the pictures in reverse order:
Lets try both smiling and see what happens.
Reverse order.
Smiling man vs Smiling woman, both black
Reverse order
Smiling white woman vs Smiling black man
Reverse order
Enough of that guy. Smiling white woman vs. Smiling black woman
Reverse order.
Whelp. No idea what that proved but I wanted to give it a try. Honestly, the results were not what I expected! I have no idea what the algorithm looks for...
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