Signals, Bubbles and the Stop Button: teacher key
How Video Sites Pick Your Videos, grade 12 edition, written for 12th grade and up. Video sites choose what to show next by predicting what each viewer will watch, using signals such as clicks, watch time and ratings. The ideas run from two-stage ranking to the filter bubble debate, with the age rules and the controls a viewer has.
Read the book. Print this page for the key.
Questions and answers
- What are the two stages of the 2016 Google paper's system?
- Candidate generation and ranking (answer)
- Search and purchase
- Upload and review
- What did YouTube add to its recommendations in 2012?
- Star ratings
- Watch time (answer)
- Social network links
- A user sees a video in their recommendations but does not click on it. What does the watch time count as?
- Zero (answer)
- One hour
- Ten minutes
- What does the COPPA Rule require of websites it covers?
- To ask every visitor's age
- To notify parents and get approval before collecting a child's personal information (answer)
- To remove all videos of children
- In the Knight Institute explainer, what does the word "engagement" mean?
- Any score defined only in terms of the moment-to-moment actions of the user (answer)
- A promise to watch
- A law about children
Words
- algorithm: step-by-step rule
- signals: pieces of information
- autoplay: automatic next video
- personalization: fitting content
- engagement: user actions