Recently I am wondering a lot. I ranked a few websites for a few keywords before and two-three days after starting link-building (manually high pr web2.0 tier1) I saw the first results. Like the serps were changing totally (going up, going down, disappeared, came back etc. google dance). But these days it seems like it takes much more time. I have two websites. One with high competition and many M/S and another one with low competition and medium M/S. I started link-building on them about 1-2 weeks ago and I don't see ANY change. Has it something to do with the google update? Whats your experience nowadays?