The meh button

Brooklynny11218 thought this was worth mentioning said
1

So what does the meh button do? Is it there for fun or is it there for marketing research?
I assumed it was for the latter and as such have been picky about what i meh because if it is being used to determine what Meh users want and don't want on the site I want to be helpful.
But reading through the forums everyone seems to just be clicking meh to continue their streak or to see what the face of the day is.