It is actually an emoticon with a human-like smiling face inside a dark circle.
The?represents a new moon or just a moon.
"Hey, it's going to be a new moon tomorrow?
"I'm excited for the new moon festival the day after tomorrow?
However, on social media platforms, it is used to represent "awkward" or "uncomfortable situations." It can also be used as a fun way to keep silent. If someone is talking to you about a lame story or awkward moment, you can use?if you don't know what to post.
"My ex-boyfriend was walking down the street with a woman and I saw them hugging each other. I was so jealous that I rushed up to the woman and pushed her away from him. The drink in her hand wet my shirt and everyone around me started laughing. It was so bad ......"
"Sure?
Or suspenseful situations like this one with. I have used this emoticon in these situations.
"This bread tastes so good!"
"What kind of bread, lady?"