Court finds Amazon can't be responsible as "seller" in a product liability claim

About Lawsuits.com is reporting that a federal judge has ruled that Amazon.com cannot be held liable for injuries caused by third party products the company sells on its website because, according to the court's memorandum opinion Amazon did not meet the state’s definition of a “seller.”  The court held that Amazon is merely a marketing place for third-party vendors, and not the seller or manufacturer, stating, among other things, that

“[l]ike an auctioneer, Amazon is merely a third-party vendor’s ‘means of marketing,’ since third-party vendors—not Amazon—’cho[o]se the products and expose[] them for sale by means of’ the Marketplace,” Judge Brann stated. “Because of the enormous number of third party vendors (and, presumably, the correspondingly enormous number of goods sold by those vendors) Amazon is similarly ‘not equipped to pass upon the quality of the myriad of products’ available on its Marketplace.” 

This is interesting because, as Amazon users probably have noticed, Amazon seems to sell products in a number of different ways.  As far as I can tell, these are some of the categories:

1.  Amazon products sold by Amazon.

2.  Products that are sold by Amazon but are not Amazon products.

3.  Products are that not Amazon products that are sold "through" Amazon.  If I understand it correctly, products in this category are ordered through Amazon, sold by someone else, but the order is "fulfilled" by Amazon.

4.  Products that are ordered through Amazon, sold by someone else, and the order is fulfilled by that someone else.

I understand saying that Amazon is not a seller of a product in the last category.  But I think Amazon is a seller in the first three.