.dpuf - is my WP website infected?

I have copied the text from one of the pages of my Wordpress website and at the end of the text was the following text:

- See more at: http://www.mywebsite.com/about/#sthash.dlMgnosq.dpuf

Code (markup):

even if this text is not visible on my mywebsite.com/about.

Does it mean my WordPress installation is infected? What should I do?

 

http://support.sharethis.com/custom...42--sthash-uzu1q8pi-dpuf#sthash.lCyIiJqA.dpbs


Clearer explanation of what that does here.. http://www.bloggerhero.com/2013/07/remove-sharethis-sthash-tag-ending-with-url.html

Nigel

 

Thank you for your reply. So that is caused just by the "sharethis" buttons that I'm using.

 

If you're worried about the security of your wp site, which you should be, download a security plugin. There are several. My favorite is wordfence.