[snazz]

I like the browsing history concept, because browsing and search history really delves deep into who someone is, but you might get a more accurate image of someone’s real-life self by using an interests questionnaire alongside or in place of browsing history to better see the offline interests someone has.

For instance, I really like cycling, but my programming-related Google searches eclipse my cycling-related ones by a huge margin, so your hypothetical algorithm would rank programming as a much greater interest than cycling, even if I spend about equal amounts of time on each.