You should be able to sue them for the value you would be entitle to charge for them using your photo commercially for the time they have it up so far, and that could be significant considering the investment (of time, effort, and who knows what else) you made to take it, and the number of likes it got them. Buying likes on FB isn't cheap IINM. Although not sure how straightforward it would be to sue an overseas entity from here.
If the photo were registered with the library of congress you'd be entitled to serious statutory damages without even having to prove actual loss.