Ouch! Western Union???
Steer very clear of that on anything that you are doing to promote bitcoin. Western Union screams scam, thanks to the enterprising lads in Nigeria at the internet cafes, who use it as their preferred remittance source for ill-gotten gains. Even mentioning WU will create all kinds of negative press both with users (the more savvy greens, and all of the blues) and with media and the authorities.
Please don't add the taint of a criminal facilitator to this world, it is exactly the kind of message we need to avoid.
My last scam was through Western Union I fell for it

lost $2,900 that I would love to have back ugghh....