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I will give you a trick, you can invite as many as you can if you can create that many google accounts. just create a ton of google accounts. then copy the invite link to the clipboard. Then use a decent brower like opera and enter the link in the search bar. Then sign in using google and then you receive the ss. Then go to settings and clear data from opera. Then enter a different google account to sign in. Then repeat the process until you are tired of making google accounts. I once did this trick to get approx 2.1 k ss on my other account. Trust me this works.