Danmaku vs. Forum comments: Understanding user participation and knowledge sharing in online videos

Qunfang Wu, Yisi Sang, Yun Huang, Shan Zhang

Research output: Chapter in Book/Entry/PoemConference contribution

41 Scopus citations


Danmaku is a new video comment feature that is gaining popularity. Unlike typical forum comments that are displayed with user names below videos, danmaku comments are overlaid on the screen of videos without showing users' information. Prior work studied forum comments and danmaku separately, and little work compared how these two features were used. We collected 38,399 danmaku comments and 16,414 forum comments posted in 2017 on 30 popular videos on Bilibili.com. We examined the usage of these two features in terms of user participation, language used, and ways of sharing knowledge. We found that more users posted danmaku comments, and they also posted these more frequently than forum comments. Even though, in total, more negative language was used in danmaku comments than in forum comments, active users appeared to post more positive comments in danmaku. There was no such correlation in forum comments. It is interesting to find that danmaku and forum comments enabled knowledge sharing in a complementary manner, where danmaku comments involved more explicit knowledge sharing and forum comments exhibited more tacit knowledge sharing. We discuss design implications to promote social interactions for online video systems.

Original languageEnglish (US)
Title of host publicationGROUP 2018 - Proceedings of the 2018 ACM Conference on Supporting Groupwork
PublisherAssociation for Computing Machinery
Number of pages10
ISBN (Print)9781450355629
StatePublished - Jan 7 2018
Event2018 ACM Conference on Supporting Groupwork, GROUP 2018 - Sanibel Island, United States
Duration: Jan 7 2018Jan 10 2018

Publication series

NameProceedings of the International ACM SIGGROUP Conference on Supporting Group Work


Other2018 ACM Conference on Supporting Groupwork, GROUP 2018
Country/TerritoryUnited States
CitySanibel Island


  • Anonymous
  • Danmaku comments
  • Explicit knowledge
  • Forum comments
  • Knowledge sharing
  • Synchronous
  • Tacit knowledge

ASJC Scopus subject areas

  • General Computer Science

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