You have to see what the scanned QR code is, it is likely to let you pay attention to the public account or download the app registration. This is a kind of activity that used to obtain new customers or WeChat public accounts to grow fans before. I used to send some plush toys and fans or something. Now it is changed to a mask. But you have to ask what the QR code is doing, do not leak your information. If you don't lack that mask, try not to scan.
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