Social Media Recommendation based on People and Tags

1. Social Media Recommendation based on People and Tags Ido Guy, Naama Zwerdling, Inbal Ronen, David Carmel, Erel Uziel SIGIR’10 Speaker: Hsin-Lan, Wang Date: 2010/10/19

2. Outline • Introduction • Recommender system • Social Media Platform • Relationship Aggregation • User Profile • Recommendation Algorithm • Recommnder Widget • Experiment • Conclusion

3. Introduction • Users are flooded with information from feed readers and many other resources. • Social media sites are increasingly challenged to attract new users and retain existing ones.

4. Introduction • Study personalized recommendation of social media items within an enterprise social software application suite. • The recommender suggests items based on people and tags.

5. Recommender system • Social Media Platform • Lotus Connection • a social software application suite for organization • profiles, activities, bookmarks, blogs, communities, files, and wikis.

6. Recommender system • Relationship Aggregation • SaND • Models relationships through data collected across all LC applications. • Aggregates any kind of relationships between people, items, and tags.

7. Recommender system • Relationship Aggregation • SaND • builds an entity-entity relationship matrix • direct relations • indirect relations

8. Recommender system • User Profile • P(u): an input to the recommender engine once the user u logs into the system. • N(u): 30 related people • T(u): 30 related tags

9. Recommender system • User Profile • Person-person relations • Aggregate direct and indirect people-people relations into a single person-person relationship. • Each direct relation adds a sore of 1. • Each indirect relation adds a score in the range of (0,1].

10. Recommender system • User Profile • User-tag relations • used tags • direct relation based on tags the user has used • incoming tags • direct relation based on tags applied on the user • indirect tags • indirect relation based on tags applied on items related on the user

11. Recommender system • Recommendation Algorithm • d(i): number of days since the creation date of i • w(u,v) and w(u,t): relationship strengths of u to user v and tag t • w(v,i) and w(t,i): relationship strengths between v and t, respectively, to item i

12. Recommender system • Recommendation Algorithm • User-item relation: authorship (0.6), membership (0.4), commenting (0.3), and tagging (0.3) • Tag-item relation: number of users who applied the tag on the item, normalized by the overall popularity of the tag.

13. Recommender system • Recommender Widget

14. Evaluation • Tag Profile Survey

15. Evaluation • Recommended Items Survey • PBR: β=1 • TBR: β=0 • or-PTBR: β=0.5 • and-PTBR: β=0.5 • POPBR: popular item recommendation.

16. Evaluation • Recommended Items Survey

17. Evaluation • Recommended Items Survey

18. Evaluation • Recommended Items Survey

19. Conclusion • Using tags for social media recommendation can be highly beneficial. • The combination of directly used tags and incoming tags produces an effective tag-based user profile.