What do you know about React, the JavaScript library? I believe it's maintained by Facebook, but that's about all I know.
It is indeed maintained by FaceBook, but also Instagram and a community of developers and corps.
Can anyone access it or is it reserved for certain people?
Yes anyone can access it now. It has been open source since JSConf US in May of 2013.
That's great for developers. Must look into it. I designed a very rudimentary website years ago. May have to learn new methods!
I did a little dabbing myself in web dev, it's really fun! FaceBook also announced React Fiber, a new coree algorithm, you may want to check that out as well!