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# Social content recommendationdzfsdkjfhshihishdifhsidhfsihfsidhfsldkfjsdlkfjslkdfj

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### Social content recommendationdzfsdkjfhshihishdifhsidhfsihfsidhfsldkfjsdlkfjslkdfj

1. 1. User Specific Social Content Recommendation (Recommending a user content viewed by his/her friends)
2. 2. What is the problem?
3. 3. The Problem• We want to recommend content to a user which was viewed by his friends recently.• But we can’t recommend a user everything his friends viewed because we have limited display space.• And there is a privacy issue because a user’s friends might not want their viewing history exposed.
4. 4. What is the solution ?
5. 5. The Solution• Rank the slideshows viewed recently by a user’s friends using some metric.• Just show the top ranked slideshow from that list.• Display one slideshow per day to the user.
6. 6. But what will be the ranking metric?• Suppose a user has 100 friends,• Each friend viewed 20 slideshows in the last week.• That gives us 100 X 20 = 2000 slideshows• Rank them according to the total number of views/favorites/comments the slideshow got.
7. 7. How will we know the correctness of the metric? By measuring the CTR.
8. 8. But where will we display these recommendations? In the newsfeed/profile page
9. 9. What about privacy?The solution to privacy is anonymizing
10. 10. But what is anonymizing ?• It means hiding personal data about an entity.• Show the heading “Slideshow S Viewed by one of your friends”• Never show “Slideshow S Viewed by your friend Mr. X”• Because we don’t want to make Mr. X upset.
11. 11. Any questions and comments?