Maybe you should re-read the article which explains with words and diagrams what "easy and visible enough" means.

The point of adding it to core is also argued in the article, which proposes an alternative to the monopoly Facebook and Google are currently obtaining.

Forteller already addressed both these questions!

Seems pretty clear to me - you open a new tab and you get a social page which isn't facebook. some of your friends are on it. who needs FB?