That doesn’t matter though, cause you have to provide all your social media identifiers - so it doesn’t matter if your handle is real or fake. You can choose to say “none”, but then you’d be asked about that by a visa interview officer, and they could reject your application for being suspicious. On the other hand, if you really had an account on a mainstream social media site, and you used your real device fingerprint to access it at some stage, they could find out and you’d never be allowed into the country.