What the Feed Learns From You: teacher key

How Video Sites Pick Your Videos, grade 9 edition, written for 9th grade. A video site picks what to show next by learning from what people watch, click and rate. The pages cover how that works, the age rules, and the controls a viewer has.

Read the book. Print this page for the key.

Questions and answers

1. What did YouTube add to its recommendations in 2012?
   • Star ratings
   • Watch time (answer)
   • Social network links
2. User A is similar to user B, and user B likes video 1. What can the system do?
   • Recommend video 1 to user A (answer)
   • Remove video 1
   • Block user B
3. What did YouTube say it learned in 2011 about clicking on a video?
   • It does not mean the viewer actually watched it (answer)
   • It always means the viewer finished it
   • It hides the video from others
4. What minimum age do YouTube's terms of service give?
   • 13 years old (answer)
   • 9 years old
   • 18 years old
5. In this passage, what are "candidates"? "The system generates a much smaller subset of candidates."
   • Votes in an election
   • Possible picks (answer)
   • Ads on a page

Words

• algorithm: step-by-step rule
• candidates: possible picks
• autoplay: automatic next video
• signals: pieces of information
• engagement: user actions