In my opinion, it is very unlikely that the Facebook company will adopt bitcoin, didn't they previously say that bitcoin is not good for investment because there is no guarantor for the asset, so they make their own stablecoin called libra and which can guarantee our assets like conventional currencies in general , but so far there has been no sign of launch.
Anything is possible mate, and maybe they just trying to diversify their portfolio and put some of them to cryptocurrencies including bitcoin, even mark zuckerberg has recently teasing people by naming his goat facebook though maybe it's just merely a tease and nothing more.
their libra coin also seem to be stagnant these days, maybe the company just playing safe and wait until CBDC out first then they gonna release their own version of stablecoin but IMHO the most logical scenario is that their company just follow other company that try to invest in crypto alike.