Filler content refers to basically all kinds of posts that you write and publish just to fill in a gap, posts that don't provide much practical information and that aren't really worthy of people's shares. "Content is king" is what many bloggers preach. And although the word "king" might be an exaggeration, you will hardly be getting any traffic if you are low on content. So looking from that perspective, there comes a question - should you publish filler content just to keep the posting frequency high?