Great post @dragosroua Here is my take...Facebook is so powerful, it's only a matter of time before they implement a crypto into their platform. They even have a large enough user base that if implemented correctly could ultimately be the coin that would go mainstream and replace fiat currency.
The same thing for search. If Facebook wanted to get in the search/PPC business, they could immediately implement a "local search engine", promote it, and immediately take revenue, if not replace Google. Facebook is already making a huge dent on Google revenue with the current ad formats, and they are only going to add more options on Instagram, Messenger, etc.
It would definitely make sense for Facebook to implement their own coin as opposed to using an existing coin.
...and they probably wouldnt even need to charge transaction fees because they make so much money as is, but imagine if they even implemented a super low cost transaction fee how much revenue it would add to the company.