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I have noticed that Stack Overflow questions are now displaying a Hash / Number sign in the address bar, at the end of the URL. Example

http://stackoverflow.com/questions/14931337/clear-the-screen-and-buffer#

Replication steps

example

hash

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This happens only when you click on comments. –  hjpotter92 Apr 2 '13 at 4:05
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not happening for me.. –  Jakob Weisblat Apr 2 '13 at 4:27
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not happening here either –  ElefantPhace Apr 2 '13 at 4:28
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I repro this on Stack Overflow, but not on Meta. I ran into it earlier today, too, when I was editing or something. It blocked my back button from working properly. I just assumed I fat-fingered something, but maybe there's more to it. –  Cody Gray Apr 2 '13 at 4:28
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No repro on SO. –  Makoto Apr 2 '13 at 5:25
    
Either it fixed itself by now, or only Firefox issue... –  Shadow Wizard Apr 2 '13 at 7:42
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Just reprod this on new Chrome: Version 22.0.1229.79. If you're quick you notice an #mlsy tacked on the end before it quickly changes to just # (i.e. http://stackoverflow.com/questions/15075893/upload-files-by-ajax-beginform-in-a‌​sp-net-mvc3#mlsy). The hash isn't initially part of the links URLs (from the questions page) but only seems to happen when linked (that is, you can hit the same URL directly and it won't happen). –  Grant Thomas Apr 2 '13 at 7:47
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Appears to happen on the last line of the full-c.js file (nth call to $(window).one("scroll", function(){k.resolve()})}}}}();StackExchange.ready(function(){});, if that's not a red herring). –  Grant Thomas Apr 2 '13 at 7:54
    
@Mr.Disappointment You un-disappointed me. :) –  hjpotter92 Apr 2 '13 at 13:03
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1 Answer

up vote 3 down vote accepted

You're just noticing a small bit of analytic tracking there.

Sometimes when we make changes we want to measure what sort of difference it made, and this #mlsy thing-y (like ?as=1 before it) is one of them. It'll go away in a week or so if I remember the numbers correctly.

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"what sort of difference it made" - it's making me have to click back twice to get back to the question list after clicking a question, and this in turn is making me a sad pony. –  AakashM Apr 10 '13 at 8:35
    
@AakashM hmm, that shouldn't be happening... I'll see if I can repro and get a fix in the next deploy. –  Kevin Montrose Apr 10 '13 at 17:37
    
@KevinMontrose was seeing it then but not now, where "it" is SO only, not other SE sites, and involves frontpage links having #mlsy on them, which script altered to # on the question page (but leaving a spurious entry in history) –  AakashM Apr 10 '13 at 18:20
    
@AakashM yeah, I've found and fixed it on our dev tier. It'll go out with the next build, which should be shortly. –  Kevin Montrose Apr 10 '13 at 18:30
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