San Jose State University

Stack Overflow is a Q&A site where knowledge entities are presented in the form of questions and answers. Stack Overflow does not allow duplication of knowledge entities. This is enforced through a variety of methods. 

Stack Overflow's Treatment of Duplicate Knowledge Entities

- Using a search function
- Providing suggestions or recommendations of similar or related entries
- Showing warnings or alerts
- Using moderation tools or policies
- Mechanisms to merge duplicate entries together
- Developing social norms that prevent or discourage duplicate entries
- Rewarding users who contribute original entries

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