Is there any data to support the strategy of suggesting similar questions on community sites involving user-generated questions and answers?
The only example of this strategy I know of is (was?*) on StackExchange. See the screenshot below:
I have assumed that the purpose of the feature is to avoid duplicate questions, so I suppose there are two questions here:
1) Do duplicate questions inhibit the growth of community-driven Q&A sites, and if so, under what conditions / at what scale?
2) Is the strategy of suggesting similar questions to users as they begin the process of creating a new question effective in reducing duplicate questions?
.* This feature is no longer appearing for me, so I'm also wondering if it has been deprecated, or is it only shown up to a certain reputation level?