In order to pevent duplicate content issues should copy for listings on eBay and Amazon be completely different to those on the corporate site?

[Tszuji]

eBay and Amazon listings - Duplicate Content?

[EGOL]

I used to be an ebay powerseller, an amazon affiliate and then an amazon vendor.

I am really careful around those domains.  They are really powerful and can throw brand new pages high into the SERPs.  So, if you make a listing there for your purple widget you could wake in the next day and the amazon page with it is above your bread and butter site in the SERPs.  If you place your whole inventory there you just invited the wild hordes into your SERPs.

On ebay the more items you place into a category the more powerful that category becomes.  Linking to items on either of these sites can be like waking the wolves.

I am not selling on these domains now because of the labor involved and the high fees.  No regrets.

As you can see, duplicate content was the least of my worries - but in this Panda environment that makes these domains even more problematic.