Furthermore, eCommerce websites (online stores) like eBay and Amazon, has plenty of Explicit marketing & Personalization features, that help online registered customers, to arrange the UI/Dashboard according to their liking and personal preferences. so eBay and Amazon are utilizing both techniques (Explicit and Implicit personalization, also called Hybrid Personalization) to give the users what they want, I mean, Exactly what they want, so they can purchase products without any interference.