It's quite strange what happens with G. On one hand it looks like we've been hit by the changes, on the other hand we've seen something very positive.
We run two sites with nearly 100% the same content, just different domains. Here is what happens to both sites at exactly the same day:
Site 1: Traffic went down by about 25%, but still keeps the same places in search results for the major keywords. Site maintains the lower level of hits since it went down.
Site 2: Traffic went up by roughly 150%, still nowhere to seen on the first 20 or so pages when searching for keywords. Site keeps climbing and hasn't levelled out yet.
Well, site 2 was actually just a test and the 200% increase in traffic doesn't cover the loss on site 1, but still it's awesome to see how different G's algorythm works for the same content on two different domains.
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