Its all about the value to the reader. If I, as a reader find the piece not only interesting, but informative too and it makes me reflect on a specific topic/question and so on, then I believe it is "Quality content".
It's about less spam, more interaction with the audience. United style for the whole page. Post memes, if you want a humoristic page. Post tutorials, if you wanna share your knowledge. Tell more about yourself, if you're into it.
What's more, make sure your pictures are highly qualified with a suitable description (if you need one).