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There is freebitco.in that I use :)

You don't need to register for FreeBitcoins.com and the website is transaparent as possible... you can see other digs and payments.

You should ONLY sell empty addresses! Keep the address after it is sold, but never use it again on purpose. The address is compromised after it is sold.

We delete the keys given to us, but you still shouldn't trust that.

Okay thank you, but like how many address I can sell

As many as you have :)

There are over 3 million qualifying addresses floating around out there!