"Readability" Rating

So here someone rates the "readability" of your blog.I couldn't find any information on their criteria for readability . I thought about this for a bit and realized that I wasn't completely certain either of what makes any material readable . Is it only about how easy it is to read that makes it readable? Or is it about how interesting the content is that makes it really readable? I think mostly the later but surely that's hardly objective . So anyways to clarify this I looked up the definition of readability. Dictionary.com defines read·a·bil·i·ty as the state or quality of being readable which left me none the wiser. Since there is no mention of the interesting quotient , I think Funkeying with its rating should be able to attract a pretty wide audience;-).

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