What this really shows is that (1) most programming is "IT" programming (i.e. focused development for specific businesses), (2) most IT programming is user-focused, and (3) we've seen a rapid shift in the customer's preferred UI environment.
Java was a revelation for people developing client software in the 90's. It was faster and easier, and in many cases could be deployed over the web. Its later wins on the server backend (which came more slowly) were driven by the client side.
And Javascript is taking that mantle, driven by the mobile world. Yes, you could still develop a Windows client app, but it won't work on your employees iPhones and Galaxy S3's. So you deploy a web app instead.
And thus you use Javascript.
[1] http://www.tiobe.com/index.php/content/paperinfo/tpci/index....
What is changing now is that people / employees have realized that it's convenient to be able to use any browser, from any device (desktop / laptop / tablet / smartphone), from any OS (iOS, Linux / Android, OS X, Windows) on the client-side.
And the one indisputed king inside the browser to code the client-side is JavaScript.
IMHO It's not exactly as if monothreaded JavaScript engines are going to displace server-side Java / C# anytime soon.
Webapps are accessed from clients using JavaScript. But Webapps themselves, at least for many "enterprisey" stuff are very often coded in Java or C# (or at least virtually always in languages targetting either the JVM or .Net).
So even though C# won't be going away any time soon, it still shows well below Javascript in terms of "acceptance".
I jest, but seriously, popularity of a tag on StackOverflow should be used to determine one thing: popularity of a tag on StackOverflow. There are more important factors influencing a subject's popularity on SO than its overall popularity. A big factor is where the community around the technology tends to congregate. Many projects (like Guava: http://code.google.com/p/guava-libraries/) officially endorse StackOverflow as the place to ask questions, because the maintainers and experts will be monitoring SO. That will have an inflating impact on its relative popularity.
Not a big deal it just seems odd to me. At least they didn't put HTML up there :)
You should have also added JS even though you use the jQuery library extensively.
Some high percent of developers in a web company have most likely worked with Javascript. Let's say it's 70%, then that's (roughly) 70% of developers who work with Ruby on Rails, Django, PHP, and ASP.net, among others. This is also true of SQL, which is the number 2 result.
Europe has a population of 595M, UK+France+Germany+Italy is 269M, or 45% of Europe. On StackOverflow, the big countries account for 54% of all European respondents.
I'm surprised to see JavaScript as the most popular language, but pretty pleased.
Living in New Hampshire I don't have many programmer friends, so communities like StackOverflow are important to me. Relatively new additions like the SO JavaScript chatroom[1] help too.
It may not feel like a community in the traditional sense to some, but in a lot of ways StackOverflow gives me the encouragement I need to help people, practice my craft and keep learning.[2] It really means a lot to me (and I'm sure a lot of others).
Also, note that the tiny link below the info-graphic has the raw data if you want to take a look at all the numbers[3].
[1] http://chat.stackoverflow.com/rooms/17/javascript
[2] http://i.imgur.com/POZmt.png
[3] https://www.surveymonkey.com/sr.aspx?sm=vU4rF_2bPVQaftSo1s69...