Hey guys, My site has been in siting comfortably in position 4 since November 2010 for a pretty hard keyword... and now suddenly it's on the second page.. There are even a lot of other new sites ranking above me.. I have around 16K backlinks too, which is more that all my competitors. What should I be doing? I just bought a few high quality backlink services including 50 .edu links, waiting to see what happens.