My facebook page suddenly give notification like this..?

[Cutie]

(the number 2 notification) Does that requires payment???? I didnt do anything!

[Ethan]

Yeah, it does require payment to promote posts. You don't have to though.

[Joseph]

Promote and Share is one of the ways Facebook is trying out in order to make money. Don't fall for it. Just delete the notification.

The link will explain how this works.

[Resnick]

I mind that you invited the friends to like that page and finally they like your page. So the notification is show.