The reviews give Wal-Mart thousands of additional pages of content to
be indexed by major search engines, which look favorably on unique content--such as reviews--compared with pages with basic product details that any retailer could have.
Wal-Mart is the largest bricks-and-mortar retailer by some stretch, but in June, it was the fifth-largest retail site based on unique visitors, trailing eBay, Amazon, Apple and its smaller, hipper bricks-and-mortar rival Target, according to ComScore.
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