?:( This makes no sense.
Why was Real.Scary banned. ?:(
What is going on, I want to play. ?:(
What is that grunting noise coming from my mom's bedroom, and where is our dog. ?:(
It's the best darn internet smiley there is.
To express the confusion and sadness both the question mark and the sad face was used.
It is used to express your confusion and dissatisfaction.