- 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

Stack Overflow's Solutions to Duplicate Knowledge Entities in Online Communities

Why Stack Overflow Discourages Duplicate Entries

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. 

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- Stack Overflow
- Quora
- Reddit
- Wikipedia
- etc

How Different Online Communities Handle Duplicate Knowledge Entities

Atwood, Jeff. (2009). Handling duplicate questions. *The Overflow*. https://stackoverflow.blog/2009/04/29/handling-duplicate-questions/

Handling Duplicate Questions

Stack Overflow

Stack Overflow's Treatment of Duplicate Knowledge Entities

Reddit is micro-blogging site that does not have a monolithic policy concerning duplicate knowledge entities. In some cases, duplication is allowed, in other cases it is not. It largely depends upon the community and moderator. 

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