1 / 5
Clicks and watch time, inferred without the user rating anything, are ___ feedback.
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Implicit feedback is behavioural signal; it's abundant but noisier than explicit ratings, which users provide deliberately.
2 / 5
A star rating the user actively gives is ___ feedback.
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Explicit feedback is directly stated preference; it's high-quality but sparse because users rarely bother to rate.
3 / 5
When the system keeps recommending already-popular items because they get more exposure, that's ___ bias.
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Popularity bias is a self-reinforcing loop: popular items are shown more, get more clicks, and stay popular, crowding out the long tail.
4 / 5
Users only ever seeing content similar to their past behaviour creates a ___.
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A filter bubble narrows what users are exposed to over time; injecting diversity and exploration helps counteract it.
5 / 5
Users clicking top results simply because they appear first introduces ___ bias.
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Position bias means rank itself drives clicks, so naive click data conflates relevance with placement and must be corrected for.