Here is what I think is a constructive post:
1) To the point answering the query asked. Reality is 905 people here just post fluff (trying to add as many words as possible even if it makes no sense).
2) Posting on new topics and not answering questions with numerous relies until you have something new to add.
905 People post fluff? Have you been compiling a list of all the users posting what you've deemed as fluff and you're currently up to 905? In case my sarcasm is lost over the internet, I know you simply missed the Shift key and it is meant to be 90%, but it serves to refute your point; there are people posting 2-sentences (like yourself) that are not making sense, because you can't be bothered to even re-read your post to make sure it doesn't have any significantly detrimental typos that would change the entire meaning of what you're saying.
A lot of words is not a bad thing, if you have a lot to say and need to say it particularly. If you have a hard time following a long-post, and never believe them to make sense, then might I suggest it is your attention-span failing you and not the poster.
I think it's funny to criticize long posts that don't make sense, while posting a short post that struggles to make sense. The irony must be lost on you, but it isn't on anyone else.
A good post to you is :
"Posting on new topics and not answering questions with numerous relies until you have something new to add. " . I think I know what you're saying, but the sentence as it is written makes absolutely no sense.
Your sentence should be closer to "Refraining from posting until you have something unique, creative or helpful to add", even that though isn't telling you what a constructive/good post is, it mostly serves to tell you what it
isn't.