“To facilitate this vetting, all applicants for F, M and J non-immigrant visas will be asked to adjust the privacy settings on all their social media profiles to ‘public’”, the official said. “The enhanced social media vetting will ensure we are properly screening every single person attempting to visit our country.”
The problem with trying to increase the signal to noise ratio is that you don’t know all of the datapoints that are being collected and some of those datapoints could be used to filter the real from the fake.
Like, in your example, if you made all of these account from the same browser then they could be linked together. If they were made on the same IP, they could be linked together. If you were using the same phone, they could be linked together. Those are just the datapoints that we know to try to protect, it’s the datapoints that you don’t know that get you.
Like, maybe your phone or desktop is screenshotting itself every 5 seconds (“for AI purposes”) or maybe the app that you’re trying to fool also secretly sends your GPS location during account creation or maybe the adversary has malware running on your PC which is keylogging you.
IF you knew all of the ways that they were collecting data on you, then you could take countermeasures. Since you don’t, you have to assume that any of your identities can be linked to your person unless you take unusual measures such, not using Microsoft/Google/Meta/Amazon/etc products at a minimum. Depending on your security needs this could also mean things like using burner hardware, non-commercial VPNs, physically disabling sensors/radios/ports, traffic/network monitoring, etc.