Trending: Apple to unveil details of massive Seattle expansion at big new office complex in Amazon’s backyard

Research firm comScore is out with an interesting report on worldwide traffic for retail and auction sites this morning, demonstrating the massive reach of Amazon but also showing the Seattle company’s potential for further growth in some parts of the globe.

Amazon’s sites topped 282 million unique visitors in June, more than 20 percent of the global Internet audience, according to the comScore data. Among retail and auction sites, that was well ahead of eBay, which came in at No. 2 for the month with 224 million unique visitors, or 16.2 percent of Internet users.

Another interesting factoid: Apple sites fare particularly well in the ranking, coming in at No. 4 worldwide (behind Apple saw unique visitors of 134 million in June, nearly 10 percent of the Internet population.

That shows how much the  iTunes and the Apple App Store have made Apple a player in the broader world of online commerce. It also shows why Amazon and Apple are increasingly finding themselves competing against one another.

Looking more closely at its numbers (in the comScore chart below) Amazon’s strength is primarily in North America, Europe and the Asia Pacific regions. However, the company’s reach is in the single digits in Middle East, Africa and Latin America.

Gian Fulgoni, comScore’s co-founder and chairman, points out in the news release that there’s still “enormous upside opportunity across much of the globe” for the large online retailers.

See the full news release for more of data and background.

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