The charges started out very small for music purchases and as it was during Christmas & New Year's I let it go until January.
By the time January arrived the charges had increased dramatically for phone time, music & other things.
Fortunately when I complained the bank refunded all charges but cancelled the card (of course).
It took about 3 weeks for the new card to arrive so all my on-line account activity was frozen. A huge hassle!
FaceBook will never get my card info for consumer purchases again. I do use their post promotion service but use a dedicated credit card solely for that purpose.