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US residents can opt out of "sales" of personal data.
With more and more social sites popping up on the Web, your preferred username is becoming directly entangled with your social identify. The reality is that it’s becoming a priority to claim your username everywhere. So how do you know if your username is available on most social sites? You could try each site individually, or you could check 76 of them all at the same site with Namechk.com.