No worries, I'm not going to suddenly go "all short!" I'm mostly using the shorter posts to try to reach a new audience (who might typically be in the TL;DR category), and perhaps a few will become regular subscribers.
I'm admin on a couple of Facebook groups with 20k+ people, and I also manage several "large" pages... so mixing up content is usually a good way keep a wider range of people interested. However there's a major difference between FB and here... in that here we have far more two-way communication.
Funny how that works. In it's 'early' days - FB was the social media spot for interactive conversations - not saying it isn't now, but it's definitely changed - and last time I was on (almost 2 years ago for my personal account!) - it kind of reminded me of two old ladies talking/ yelling at each other at the same time.
People are excellent at ruining things with their need for attention (referring to FB here, not you mixing up post lengths on your blog -which sounds like a good idea!)