Why is there a large discrepancy between the stackoverflow tag frequency and the TIOBE Index?

Posted by Lo Sauer on Programmers See other posts from Programmers or by Lo Sauer
Published on 2012-09-23T22:03:27Z Indexed on 2012/09/24 3:50 UTC
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By recently looking at the TIOBE Programming Community Index (Sep 2012) I noticed the following order:

C
Java
Objective-C
C++
C#
PHP

When looking at the tag frequencies of stackoverflow however, the situation is as follows:

C#
Java
PHP
JS
Android
jquery (JS)
iphone (Objective-C)
C++

(Java takes the lead when accounting for Android tagged posts w/o a Java tag). JavaScript also likely has surpassed PHP in total numbers of programmers?

I realize the tag-frequencies may not be the best indicator, but it is likely a sufficient measure nonetheless.

What am I missing that explains this discrepancy, especially for ANSI C?

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