YC sending weird traffic?

Anyone else noticing weird traffic from YC recently? A couple of my blog posts have been posted recently - none got much real traffic but i'm now getting +75 hits from expired YC URLs daily.

example: http://news.ycombinator.com/x?fnid=bu1a8HSpa3 http://news.ycombinator.com/x?fnid=w0rxaX4D1c

am i missing something? is there some link sharing thing that could be sending these hits legitimately? otherwise i'm guessing something weird is going on. i would have searched for this to see if it had already been commented - hopefully not a rerun..