How to keep the wrong sorts of people out of your place, using Google FLoC.

  1. Post a FLoC checker QR code.
FLoC QR code
  1. Make everybody scan it when they come in.

  2. Check their phones.

  • Green: good cohort

  • Red: bad or missing cohort. If they turned off FLoC or installed an alt-browser, they’re probably hiding that they’re in a bad cohort.

  • Blue: Apple Safari, you figure it out.

(no, I don’t think anybody should actually do this, but it’s only a little bit of JavaScript so people are certainly going to try. So it could turn out that non-Google browsers will end up having to provide a realistic cohort instead of just not implementing FLoC.)