Stackoverflow is a social Q&A website. It recommends questions to users who are interesting in the topics of the question based on the tags in user profile.
This article is related to user privacy. Users' trajectory is an important information as an input in location recommendation systems. However, because it is a sensitive data, it should be protected w.r.t user privacy.
This mobile app is a social news aggregator that has recommendation engine and adaptive representation features based on your interests (in user profile). It collects implicit feedback from user interaction with the app and integrated this information o user profile.
When Amazon recommends a product, it is clearly not a coincidence. What their "collaborative filtering" recommendation system does is to retarget a visitor with what he or she has bought in the past, which items they have put into their shopping cart, and what other similar customers have recommended, viewed or purchased.
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