Nope, you may have been misinformed. Facebook is still growing rapidly in terms of active users and time on platform... It's shitty, but it is not becoming any less popular.
edit: just double checked myself -- they are still growing, about 3% per quarter, which is pretty fast given the scale. The rate of growth is slowing so perhaps in the next year or two we'll see if it actually declines.
And Facebook is reportedly still working on a stablecoin. For those who gave up Google -
https://www.google.com/amp/s/www.newsbtc.com/2019/03/11/facebook-crypto/amp/
Oh yeah, FB has invested in a lot of blockchain talent from what I understand. I haven't had time to look much into that yet, I gotta read more.