Recently (5h ago) I got the Announcer awarded for this question. That's fine, thank you; the only problem is I don't remember to have any activity related to that question, let alone posting the link to it somewhere. I know that 'question sharing' works in strange ways sometimes, still would be great to understand how it worked in this case. )
(yes, I checked this; but in that case, the question itself was of the OP)
In this answer you are linking to an answer in the question Save and render a webpage with PhantomJS and node.js. It can be easily found in the list of linked questions from the sidebar.
Links from within the SE network shouldn't count towards the badge. Maybe the question got crawled and mirrored somewhere. Another possible explanation is in the question @psubsee2003 posted in the comments; Some people may just disabled the HTTP referer header field. Similar to this some people could have bookmarked the shortlink from the answer.
http://stackoverflow.com/a/9978162/1229023is used—on that very same page. I cannot find it there today, nor in Google's cache. Also, sharing within the network itself doesn't get you any badge. But once you use such links within SE then others might copy it. Maybe a comment with a link you deleted? But even then Google or Topsy would often find it.