Targeted advertising is big money these days. eBay must have been feeling a little left out, as the company just announced that it will begin sharing the browsing habits of its users with third party advertisers.
This is similar to what Google, Amazon and Facebook already do, and is the reason that you get loads of ads about that new car you just looked up or the flight price you just researched. eBay says that marketers will not have full control of your data, but eBay itself will sell targeted advertisements to those companies.
In an interview, Stephen Howard-Sarin, eBay's head of digital display in North America, said:
"We're now commercializing that capability for the benefit of other marketers who want to reach shoppers. If you're an agency and it complicates your life because we've got a unique pool of data that you don't have, tough. It would be shortsighted of us to give that data away."