As much as I would like to think that my longer, carefully plotted essays are the most popular items I write, such is not the case.
I get higher readership, more comments, and more reactions with shorter posts.
What may not be obvious is this: it's often harder to write the shorter posts. This is especially true if you're trying to write conceptual, idea-based material (a non-issue if you're simply posting links, for example).
So, shorter posts it is.