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For context, the initial Panda change affected about 12% of queries to a significant degree; this algorithm affects about 3.1% of queries in English to a degree that a regular user might notice.
...the impact is higher in more heavily-spammed languages. For example, 5% of Polish queries change to a degree that a regular user might notice.
The anchor text thing is something that I believe was tweaked a month ago, more or less. I suspect this is something else.
it appears to me that most of them had their spammy links for quite some time --even for years--
I wonder though if a lot of low quality small spam sites with few links and exact match domains might rank well because of this.
Most of the sites being hit were using anchor text links from low quality sites
...especially if you find them attached to big brand sites that tend to get away with more due to brand authority.