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This might sound like a strange request, but here's what I'd like to do:

Know how often a certain keyword or tag is used, over time, on StackOverflow.

For example, for this keyword: "github"

How many times was it mentioned in Jan 2012, Feb 2012, March 2012, etc.

Similar to Google Trends: http://www.google.com/trends/?q=github

I'm looking for up-and-coming technologies and things that are trending. I assume that the number of mentions of a word would be an interesting indicator.

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4  
We're pretty well obsessed with analyzing data. Know any SQL? You should familiarize yourself with the Stack Exchange Data Explorer – Brad Mace Aug 10 '12 at 1:32

Here's what I've got so far: Tag usage by week

It's a relatively slow query since it looks at all questions ever.

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Wow, cool! I tried it with keyword "github" and the sum of all weeks was 3,073. Then, I went to this page: stackoverflow.com/questions/tagged/github and it says "3,398 questions tagged [with github]". Any idea why there might be a difference? – yarone Aug 10 '12 at 5:10
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The Data Explorer uses a separate copy of the data to avoid hurting site performance. It only gets updated every month or two. – Brad Mace Aug 10 '12 at 5:46

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