What is the #ID in the URL for?

[Jaredr]

On the forum's index, there is an (apparently) randomly generated ID number after the URL, but I'm not sure what it refers to. Can anybody tell me?

For example: http://www.site.com/forums/#axzz1sV917kt

 

[DBA]

That's not a default feature, it looks like a tracking code similar to what these guys use.
http://www.tynt.com/

 

[RobParker]

Have you enabled AddThis tracking?

 

[HWS]

AdThis Tracking it is.
This is not a default feature...