The system uses a combination of algorithms (no, not AI) and eBay's massive data set to craft your personal store.

Interests is available right now through eBay's Android and iOS apps in the US, and should come to the web and other countries in the "coming months." In a sense, this is a counter to rivals like Amazon -- you may be less compelled to visit the competition if you can regularly something you'd like on eBay's home screen.