That's why I started using multiple accounts, makes it a lot easier to keep the algorithm on topic and not get side tracked just because you searched for a song or game once.

In the end the core problem with the recommendation system is simply that there is only one list of recommendations, which makes it damn near impossible to switch to a different topic unless you start account hopping. The new topic-bar helps a little, but still offers no way to get rid of an unwanted topic completely.