Although, I am not off to a very good start. This post is already expanding to a medium-size post...
Short, sharp blogging (in my experience, at least) is built on two principles:
- Connect the thought "that's interesting" with the action of writing the blog post as closely as you can. Don't leave tabs mouldering in your browser, don't leave draft posts in your drafts folder. Get it done, and get out.
- Be very clear what the point you want to make is, make it and quit. Over a while, the various pots will built into a narrative of the issue you're exploring - and you can bring that narrative to a peak, if not a climax, by writing that longer post. But save that until the point where the creative damn is going to burst, by letting some pressure out over time with those short posts.