There are a number of reasons why this isn't the end of the world.
Is Facebook considering selling off Instagram? Maybe they just want to have their options open if the world does come to an end on Friday?
Perhaps they need the language in order to do what Facebook is already doing when they let you "Like" news articles and other pages on sites outside of Facebook. (Please feel free to "like" and/or "share" this article.) Or maybe they have a new feature or product up their sleeve that necessitated a change.