Unusual characters at the end of review URLs?

[Welsper]

I realize that this might not be the 100% most appropriate place for it, but it's the best I could think of...When I visit a review, there are some random characters appended to the end of the URL after a pound (#) sign, ex http://hardocp.com/article/2012/12/19/samsung_840_series_tlc_250gb_ssd_review/#.UU9Q8xy2r6k. I don't recall ever seeing these before, what purpose (if any) does it serve?

 

[evilsofa]

I've been wondering about that myself. It doesn't just happen here; when I google for PartedMagic, I get the site:

http://partedmagic.com/doku.php

When I go there, after a few moments, something like #.UU9pchlcMlU gets added to the url.

 

[FrgMstr]

It is a plugin we use for all the share buttons.