Examples include eBay, an auction service which uses a system of customer feedback to publicly rate each member's reputation.
Jets.com offers similar services online, as well as an auction service.
It recently imposed fees to list items on its auction service, which had been free.
The company announced a limited live auction service last year through its eBay Premier site.
"I'm going to eBay that speech," he said, transforming the name of the online auction service into a verb.
Amazon.com, the largest on-line store, has just opened an auction service.
Much of Ms. Whitman's job is understanding who uses the auction service.
It recently added an auction service and plans additional services soon, though Mr. Hayes would not go into details.
By May 1851 Richards added an auction service to his business.
Overstock.com, an online discount retailer, recently started a social networking feature that is designed to build trust among users of its new auction service.
