Lastly I'm not that active on this site, but I made a map of CogSci.SE, basing on tag co-occurrences.

enter image description here

Some more description e.g. on a respective post on meta.math.SE.

The project is on GitHub: https://github.com/stared/tag-graph-map-of-stackexchange/wiki (feel invited to tweak the plot to your taste).

I hope you like it! (For site promotion or just some insight.) :)

And before anyone asks, colors are for graph communities (groups of nodes which have a lot of connections between each other).

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Ooooh, purrrrdy! Thanks Piotr! – Josh Gitlin Dec 6 '12 at 23:38
    
This is cool -- but how did you get the data? CogSci.SE is still in beta, meaning its info isn't in Data.SE! – Aarthi Dec 7 '12 at 15:26
    
It makes it harder and slower, but it is possible to use SE API to harvest all questions. The instruction is here: github.com/stared/… – Piotr Migdal Dec 7 '12 at 16:38
    
@PiotrMigdal Would you like me to get you a CSV of the relevant data? I could send it via a mod here, or I could email it to you directly. – Aarthi Dec 7 '12 at 17:47
    
@Aarthi What do you mean by "relevant data"? But sure, why not, I will see what's there (e-mail preferred; or if >1MB then Dropbox link or sth, please). – Piotr Migdal Dec 10 '12 at 19:10
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No problem! Could you please email aarthi at stackexchange dot com for me, and I'll send you the CSV! – Aarthi Dec 10 '12 at 19:14
    
Thanks for doing that @Aarthi! – Josh Gitlin Dec 12 '12 at 14:33
    
I am really late on this, just saw it. Awesome! – Artem Kaznatcheev Dec 16 '13 at 1:03

I made an interactive version of the above, with always up-to-date data, TagOverflow. You can check tag grouping - i.e. for the sake of eliminating synonyms or poorly-defined tags.

Code and a more detailed description is on Github.

enter image description here

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