A kind of report, a rumor, we still don't have validation. We can misunderstood that it's part of their expansion, I have read the article and searched for other related articles and majority of them says that facebook should public it already to break the rumors.
This could just be another type of their marketing. Spread as many rumor or teaser so the public will remain engaged and talk about them every now and then. They need to stay relevant in this fast changing crypto market.
Why people like this kind of rumor/news is because it's a big company. And while we're waiting for their announcement, a lot of articles are coming out to attract more excited people about them.