Privacy International, the London-based group, is concerned about websites that make it overly difficult for users to delete their accounts.
After researching the issue, it has identified , and as some of these sites, but has praised and for the ease with which users can delete their accounts.
Although it hit out at Amazon for not providing any "delete account" facility at all, it decided to complain to the ICO specifically about eBay.
This is in part because of its size, with eBay's UK user base at around 10m, but also because it is concerned that eBay's privacy policy allows it to share user data with around 10,000 third parties under its VeRO programme in connection with an investigation of fraud, intellectual property infringement or other unlawful activity.
"We believe this blanket provision in eBay's terms and conditions is disproportionate and possibly insecure, and we have also asked the Information Commissioner to investigate the nature of this relationship and the scale of disclosures of personal information to the programme's members," Privacy International said.
A spokeswoman for the ICO confirmed it had received the complaint last week and had contacted eBay, but said it has not started a formal investigation.
In a statement, eBay said: "EBay is fully compliant with the Data Protection Act 1998 and takes the safety and privacy of its users very seriously.
"Our customers can find out how to close their eBay accounts by visiting our Help pages, or by referring to our plain English Privacy Policy, which clearly outlines how eBay may use their data, and how users may close their accounts. Links to both can be easily found on each page of the eBay site."
According to Privacy International, its complaint against eBay will be followed by complaints in Europe, North America, Australia and Asia against websites where appropriate.
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