Google made a "core update" as we know and they confirmed this past weekend . I can't say for sure what effect it had on my sites since I'm actively building links and they move up and down all the time and I can't contribute the change of rankings to the update or on the new links . What I've notice so far in the niches i track are 2 major losers - Reddit and DailyMotion . KW #1 - 4200 searches, medium competition - a very active, informative subreddit was ranking steady on #3 for the past year, now it's down to #9. DailyMotion video was #4 for about 6 months - now on the bottom of page 2. KW #2 - 1800 searches, medium competition - subreddit was #2 for ages now down to #14, DM video from #5 to bottom of page 2. Same for a few others KWs and niches, looks like Google took out DM as it's a direct competitor to their YouTube. Other "parasites" like Tumblr and Blogger still rank the same. Did you notice anything similar ?