This is the 855th most frequent Macedonian word.
фејсбук
Facebook.
Here, 'Фејсбук' is used as the proper name of the social media platform.
Јас ја проверив мојата идија на Фејсбук утрово.
I checked my idea on Facebook this morning.
In this case, Фејсбук refers to the platform where the action of uploading occurred.
Поставив нова слика на Фејсбук.
I uploaded a new picture on Facebook.
Here, Фејсбук is used to describe the medium through which the message was sent.