Why is there a "#xxx" appended to the pages in this site?

Hi, please go to transformbusiness.sg.
If you were to browse through the pages in this site, you will notice that upon page load, a string is appended to the url.
The strings look like these...
#.VP45j-HMIsk
#.VP45mOHMIsk
#.VP45oeHMIsk

I'm not the developer of this site, but I was asked about what these strings might be.
What are they and how and why are they appended?
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killdurstAsked:
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Brian TaoSenior Business Solutions ConsultantCommented:
I think it's some kind of session ID and is programmatically appended to the URL
killdurstAuthor Commented:
I still can't find the Javascript code that is doing that or any code that uses the hashtag in the url.

If any of you have any ideas, please share, thanks!
Jason C. LevineDon't talk to me.Commented:
I still can't find the Javascript code that is doing that or any code that uses the hashtag in the url.

It's probably not a session tracking code.  More likely, it is from the caching that site is doing.  By appending these codes to the end of the URL, it leverages browser caching more effectively.  When you update the content, a new code is generated and the browser knows to pull from the server instead of displaying it's cached copy.
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killdurstAuthor Commented:
Thank you guys for all of the comments so far.

Yes, it does seem like it's something the developer or cms implemented to ensure that the visitor's browser load the latest version of the page at all times.

The CMS used is Django. Is this a Django thing?

I can search the whole folder containing the website files for the code that is doing this.
No luck so far.
Any suggestions on what words or phrases I should search for? Thanks!
Jason C. LevineDon't talk to me.Commented:
The CMS used is Django. Is this a Django thing?

Possibly, or an extension, or a server thing.  It's almost impossible to tell from this side.
killdurstAuthor Commented:
Turn out that it's an addthis.com thing...

http://support.addthis.com/customer/portal/articles/381254-address-bar-sharing-analytics

They've even provided the JS to turn the tracking on/off.

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killdurstAuthor Commented:
Found the JS code doing it.
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