| Each time a document is sent, the receiver can check with the security firm to verify the sender's identity. |
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| Unlike social networks like Facebook and Twitter, messages sent through BBM cannot be traced back to the sender's phone. |
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| Liu could not say when the letter was postmarked, nor if it contained a sender's name. |
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| The recipient would receive money in a new account, and PayPal would debit the sender's credit card or bank account. |
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