[baisong]

Of the 4 basic emotions, missing only: fear/surprise.

"A commonly-held belief, first proposed by Dr Paul Ekman, posits there are six basic emotions which are universally recognised and easily interpreted through specific facial expressions, regardless of language or culture. These are: happiness, sadness, fear, anger, surprise and disgust."

Recent research melds these into just 4, combining fear/surprise and anger/disgust. http://www.gla.ac.uk/news/archiveofnews/2014/february/headli...

[baisong]

Actually, I guess that's what "Wow" is. They've covered all the bases!

[MichaelGG]

What's the button for "This is stupid" or "I dislike this"? I'm not angry about it, I'm not sad, I just think it's a bad idea or lacking thought?

As other commenters say, it's really about having positive-only things.