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Usually one line posts aren't constructive because you usually can't contribute much with only a few words, and they take less effort then a post with actual thought in it. Not all one line posts are bad though - sometimes you can contribute a lot with only a few words, or answer a simple question.
No, minimalist approach is wise, you can do posts longer if you use more words and at the end you
have same sentence.. If you follow Greek philosophers you should know what i'm talking..
Also jokes are allowed..They can contribute to topic, and best jokes are short ones, for example, But in most cases they are removed.