The article and info-graphic is here: http://www.social4retail.com/everything-about-blogs-for-retail.html
I Can Speak Quantitatively This Is True
I started this site on March 27th, 2012 because there wasn't a site that "aggregated - news retailers/brands could use to be relevant in today's wired world". It started very weak....20-30 people/day....UNTIL I started to blog and post other blogs that people sent to me. (Yep, you can send me your content and I'll post it...IF it's relevant!) (Send me your posts to:email@example.com)
Look at the image. The image represents this site's statistics. Every time I write/post a blog you will see the spikes. Yesterday I pontificated about how/why your website is critical to staying in the game and had over 1,000 unique visitors.
My average "unique visitor" count hovers around 120 people a day....BUT when I post a blog that number triples, and sometimes goes up 10 fold.
Every huge spike correlates with a blog post. Go ahead and look at the post dates and the corresponding spikes.
It's rally hard work, to write and be relevant. It's not about blogging everyday, unless you're doing political/economical blogs, it's about "relevant content" and to explain a point of view and give the audience the tools, resources and/or ideas that are/stay relevant.