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The site you mentioned has the looks like article directory , and most likely will become a general article directory in future.I Believe that your intention of posting guest blog is to obtain backlinks from relevant site, so i am not sure how knowledge partner would help you.Instead try googling for keyword+ "write for us" or keyword+"guest blog" feel free to use variations like broader keywordseg: if you are in the weight loss niche try searching for health, you'll find more sites that you could possibly submit to.