Thirty-five or forty years ago, McDonalds got caught out serving kangaroo in their hamburgers. Much more recently it was found flavoring the french-fry oil with a bit of tallow, to the great offense of vegetarians and I think a few Hindus.
However, it has always been much smoother at the apology business than Facebook now seems to be.
The kangaroo thing is an urban legend. Think about it, why would shipping kangaroo all the way from Australia be cheaper than locally sourcing beef? Hell, kangaroo in Australia costs more than Australian beef.
And, kangaroo is actually a very lean meat, much better for you than beef. Plus kangaroos are much better for the environment, the don't fart methane, like cows do.
However, it has always been much smoother at the apology business than Facebook now seems to be.