As Stack Overflow grows — or any other Q&A site in the Stack Exchange network, really — there’s a natural pressure to discover and link duplicate questions. The more questions you have, the higher the possibility a given new question isn’t in fact a new question, but a duplicate of an older existing question. Because of this, we’ve continually enhanced the tools for finding, linking, and merging duplicate questions:
Handling Duplicate Questions
Linking Duplicate Questions
Improved Question Merging …