It didn't went so well the last time you had no doubt about a question of great importance #heykrellinmanup http://webdiplomacy.net/forum.php?viewthread=944147#944147
There are no grounds on which the US can devise a law to ban facebook credits. Facebook pays its taxes in the US dollars and in the end, credits are nothing more than an intermediate step in a purchasing process that in no way delegitimize the position of US dollar as a legal tender. If you could ban credits, you could ban gift cards, token coins or food stamps as well. You cannot construct a case against it unless you use some national welfare/security/w/e argument to circumvent common law practices that apply in similar cases. In fact, if the US companies gain dominance in the area, their profits will grow and the amount of taxes they pay will as well. Uniting the e-currencies under you has all the benefits of controlling the money supply without the need to bear responsibility that comes with it. It's a fucking gold mine.
abge, I can also "mine" USD by putting them in a bank and rake the interest. The fact you can mine bitcoins is a pointless technicality. You can also use the processing power you spent that way to "mine" USD by lending that processing power for a fee. You could probably "mine" more USD by hiring a guy to grind in WoW on your rig than you would get in bitcoin equivalent for the same time. You mine real-world currency by spending factors of production, be it labour or capital. You mine bitcoins by spending processing power, which is derivated from capital. The apparent difference between mining bitcoins and mining USD is that mining bitcoins increases the money supply whereas mining USD means an existing USD changes hands. But since the supply of bitcoins is predetermined, and from what I gathered, the daily overall mining quota is predetermined as well, and mining bitcoins is a competitive industry, the miner's influence on the price of bitcoin is negligible - which is marketed as bitcoins feature after all. In the end, bitcoin is just a currency for those who hate central banks. That's the only distinctive feature. Everyone is free to spend their time on them but environmetalists should stay clear of this shtick that is based on wasting electricity in unproductive use of processing power - if at least you could mine by playing gunboats ;)
jmo, there are also people who would never buy a product from Apple. I don't think Apple really minds. Some would never create an account on facebook. Some would never replace books with e-books. Yet, the trend is clear and credits are happily being used.