A Bitcoin Cash token could possibly be pegged to Facebook's crypto making it possible to transfer it and exchange to and from bch on the BCH network also making it easy to redeem it and make....
But isn't it a stable token? Any stable token could replace it.
If you have FB coins as BCH tokens, you have to redeem them. If you have any other stable coin, you have to exchange them to FB coins. Both ways leads to a trust third party.