Klaark
When reading work posted on the Internet, do you prefer your chapters long or short?
I'm not going to define long and short, and if you have an answer anything like "I prefer chapters to be as long as they need to be," I'd ask you to not bother posting.
Unfortunately the answer really is "as long as they need to be". The point here is you don't have a benchmark to reach for each chapter's length; when you think a segment is over and done with, you can end it. I think trying to conform to either "long" or "short" is a bad idea.
However, since you mentioned "posted on the internet" I'd go with short. Not only are people's attention spans much shorter online, it's hard to read on a screen and you tend to lose your place a lot. Short chapters make things more manageable and are less daunting to the reader. I'm sure most of us will look at a solid block of text, groan, and skip it. If it's broken up frequently by chapters it feels less of an immense task.
Honestly though, there are a lot of other factors. Are you posting a completed work or updating an on going one? Do you have page breaks? What are the demographics of your audience? What size font are you using? How good is your story? There's any number of factors that could influence the effect of a long chapter vs. a short one.