Geez, I thought the days of email chains mindlessly forwarded without any research ended in the 90's and 2000's. Social media is used for this now, what you should be worried about is entities that use social media to spread disinformation. If you are going to share something, do some research.
Scanning a QR code isn't going to magically steal your info, the QR code suggests you open a website where YOU enter your information and it is stolen because YOU gave it up. The is no magical app in a QR code that gets all of the info from you phone.
Thanks for the voice of reason. Now can you jump on my Facebook feed and tell it to the hundred or so people that have posted on there?