I downloaded the Tor Browser and use it. I started Tor Browser and tried to register to facebook. Facebook asked me a mobile phone. I tried some my mobile phones and all of them were incorrectly (already used). Then I closed the Tor Browser and opened again. I checked, IP address is different, than in prev. time. Then my girl is tried to register, entered his data (fully different, than my data), facebook asked her phone number, she entered his phone number and she received "You tried much time. Please, try again later" after first try. Why? How Facebook knows, that this is the same browser?