I take it and use it seriously as "this made me think" but can also be "not sure if I agree, but thinking"
I also assume it means as much. It's easy to think of the worst possible situation when you have an ambiguous emoji like that. If anything I take it as an "this was interesting." In my book, if someone reads something I wrote and finds it the least bit interesting, I've done my job. That's my two cents at least.
Also, I 🤔'd this post for fun. ;)
Valentin, you're a better man than me.
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