FB‘s open source projects are one of the few things they are doing right, so why avoid them? AFAIK the licenses are ok, so they are interchangeable in the end as maintainers.
What about that patent license noncompetition thing? That's cool? Or did that get pulled?
https://code.facebook.com/posts/300798627056246/relicensing-...
EDIT: this apparently was fixed last month.