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If you start a forum or a Q&A site. At the begining you would create the content yourself. At some point you get visitors from google.

What do you think: How many users du you need to run a forum or Q&A?

I mean that the visitors start to register and to contribute.

I hope to hear some real life examples or estimates.

Edit: Maybe the question is not fully correct. Probably it is also important to know other parameters like: "How many active topics are on the site" ...

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closed as not constructive by Su', John Conde Jan 25 '13 at 23:28

As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for guidance.If this question can be reworded to fit the rules in the help center, please edit the question.

There's not a real answer possible. Communities can form and be active with 3 people or 3,000. – JCL1178 Jan 25 '13 at 19:35
For Q&A sites: general guideline is 500 visitors per day based on numbres published by Stack Exchange's Area 51. E.g., area51.stackexchange.com/proposals/48872/magento The standard for a forum is lower: 100 visitors per day to start is a general guideline based on my experience launching new forum communities. Can provide more detailed stats on that if this question is re-opened. – mikey_w Mar 21 '13 at 6:07

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