No, targeted advertising and recommender systems are distinct systems with different data inputs. Recommender systems work only with anonymized interaction data from within the platform itself, without accessing cross-site behavioral profiles or third-party user attributes that ad-targeting platforms rely on. A recommender's personalization is based entirely on what a user has done on the same website. This distinction matters for data architecture and privacy compliance: the data scope of a recommendation system is narrower and more contained than that of an ad-targeting stack.