characters being appended to urls

I am working on an inherited drupal site and nobody can figure out why the urls are having characters appended to them (.com/node-title/#.ULaLca13N2M) with '/#.ULaLca13N2M' being the appended text

it appears to be some sort of javascript based thing (i think) as it is appended to the url after the page is done loading

has anyone ever encountered this sort of thing in the past? or have any clues as to where I should be snooping around in my files. I have searched high and low in the theme files to no avail.

thnx
C