Are you arguing for more government control of monetary policy through regulating Facebook or less government control of monetary policy through Facebook's competing currency?
It seems like Facebook is worse in both directions. Both serving the interests of activist regulations and governed by a corporation with it's own interests first.
> I mean we don't normally let companies or individuals create their own currency right?
Actually that happens all the time; for example we have store credit, loyalty points, virtual "gold" in games, poker chips, and a long list of community currencies[1] like BerkShares.
Why wouldn't companies or individuals be able to create their own currencies? In the end it just means people are discussing and reaching consensus on the ownership and value of some common unit of account, which is a direct expression of the rights of freedom of speech, freedom of association, and ownership of property. (And by "property" I'm referring only to what is being bought or sold, not the currency itself, which in the case of virtual currencies or cryptocurrencies might not even be property, just pure information about a completely theoretical system which people happen to agree on, which is 100% a matter of speech.)
It seems like Facebook is worse in both directions. Both serving the interests of activist regulations and governed by a corporation with it's own interests first.