Who is this Alejandro Caballero? I will never give this news any importance, until Facebook issues a statement confirming it. In the past also, I have heard about many such rumors, and all of them turned out to be fake. Facebook has consistently taken a very hostile approach to the decentralized cryptocurrencies, especially Bitcoin.
Obviously they are trying to increase their revenue by coming up with the centralized cryptocurrency called "Libra". But then, why should they give their competitors any advantage by allowing those modes of payments? In Facebook apps, the payments should be in Libra, right? Why they should allow coins such as Doge, which can pose competition to Libra?
If you check when thee op posted that post, you will see that it has been 2014, and I am surprise someone had to revisit that old post and everything that the op posted there is all lie. You know how Facebook has been had on cryptocurrency in past prior to now, if they had been interested in cryptocurrency since 2014, we would not have seen all those harshness from them, it is just of recent that they decided to come up with their own blockchain technology also which will in turn produce a centralized coin called Libra.
From their little abstract that I saw, they are not competing with anyone and they are not partnering with anyone, but creating service that even the banks, government and many citizens will want to use which I really doubt since it is a centralized coin, the only group of people that would support their coin are banks.