What's going on?

I think your idea is incredibly interesting and daring. I actually can't wait to see what data you come up with. I would be too scared to do what you're doing on one of my social media profiles because honestly I'd be too afraid of what people thought or said, both on the social media platform itself, and in the 'real world'.

I think that what people mention about you face-to-face could be an undesired (or perhaps desired) consequence of changing your profile to what you're describing.

Have you thought about what description you're going to add (if any) to the picture, or what comments you're going to write to those that comment on your profile (if there are comments on Wechat [sorry not familiar with the platform], or if you want to reply to comments)?

I think this is a great idea! When I'm mad at someone, I did the same thing when I was in high school, but my friends knew that I did it when I was angry, so they didn't have a surprised reaction. However, if you're always happy and always have a happy profile picture, suddenly the avatar to go black and huge change in mood could get very interesting reactions. It sounds very interesting and I'm really curious!