Well, the big question is if UX of Facebook is good. Anyway, here isn’t such thing as page 2 because of infinite scrolling. So by definition, and UX, you got second and tenth page in the same package.
Yes you have. And now you are asking in the name of older people 
that notification menu should override the zooming. I don’t think any app can do that.
Because of zooming. Now I’m not totally sure but zooming makes flipping and flopping impossible.