I am always on the lookout for gems of information and here is one I found today on Seth Godins blog:
He basically says that when you go to write a blog post, an article, or an Ad that you start by writing a classified Ad. That way you make sure that you get your message across as you intend. Simple really 
So no there is no excuse for writing your blog posts and articles as they will be short - well maybe one or two
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