Depending on what type of blogging you're doing it's really about relationship forming, making friends and socializing. That way you get links, have you content shared, end up on high profile bloggers pages.
Seriously you have to produce, google loves the content and its what your readers expect.
I dont really agree with the stumbling thing, i dont find they convert or click ads, but thats been my experience, i'm will to be proven wrong on this.
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