Yep, seen it before, why the **** are we wasting bandwidth on a FB item. Fair dinkum, this is a crap topic, the op should have more sense.
Because some (like me) find it interesting that roughly 75% perceive the colours incorrectly (the dress has been proven to be blue and black). I find that particularly of interest as people make assumptions about how others view the world, and this simple example shows that is folly to make such assumptions. Especially in the case of people who love to harp on about 'common sense'. "What are you talking about? It's common sense, the dress is white and gold!" And you will find 3/4 of the population will agree with you, and that 3/4 will be wrong.
If you don't find that of interest, that's fine, but you are welcome to not exercise your digitus secundus manus and selecting to view the thread, there are plenty of others that I am sure will be to your satisfaction.