How come when i try to send a message on facebook, it doesnt work?

There can be a couple of different reasons why your message is not being sent of face book. You could have the send to box blank. Sometimes the server has problems and you may need to start the message again another time.

Photo Credit:

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Further Reading:

Why doesn’t Facebook Mobile support sending SMS messages to Google Voice numbers? – http://www.quora.com/Facebook-Mobile/Why-doesnt-Facebook-Mobile-support-sending-SMS-messages-to-Google-Voice-numbers