Searching and bidder shadowing tool Auction Shadow has added a feature which analyzes seller feedback and other information to enhance buying safety.

Auction Shadow's "Security Services" show how many unique buyers provided feedback to the seller, if the seller changes the content of their listings frequently, how the seller's feedback has changed over time, and more.

Auction Shadow's "ShadowSearches" allows users to 'shadow' other eBay shoppers as they bid. Users enter the user IDs of a few eBay shoppers they have bid against, and the system regularly searches for auctions being bid on by them. Alert messages are emailed whenever results are found.

Auction Shadow is a free service.