Sometimes I feel like I'm the only person who doesn't want 15 different companies telling each other what I just ate for lunch.
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I handle QR codes by taking a picture and decoding on the command line using zbarimg. If the decoded output is a URL and looks safe I might visit the site. No way I'm letting an insecure device (basically all smartphones) follow random links blindly like that. And no way I'm giving up my data points for free if I can avoid it (remember how market researchers used to pay people to participate in focus group interviews?)