This method of trying millions of password combination (known as brute force) is NOT widely used. It is not an efficient (if practical) way of getting login credentials. It is used in unlocking zip files where you aren’t locked out.
You can always use Proxy, VPNs but that will slow things and impractical in lot of cases.
AFAIK Most used method of hacking social media and related things is Phising and Social Engineering.
Edit: grammar fixes
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