You can now play a very early in-progress Merchant Commander on Facebook. Huge caveat, though: it’s very incomplete and rough.
It will change rapidly for a while. Holidays will slow me down some, but what I mean is that it is not going to be stable for a while. Just don’t want anyone mad at me because the game is not what you expected.
For all the gory details, here’s the Merchant Commander Alpha testing page.