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Traffic decreased about the same on all pages. I was however surprised that the thin pages was 40% of all landing pages. This might actually be one explanation. It still doesn't explain the extremely sudden drop however, since I've read content-related algo hits are usually more gradual (over one or several weeks). I might be wrong however. Stats: 75% decrease in traffic on thin quote pages (40% of all landing pages) 80% decrease in traffic on all other content rich pages (60% of all landing pages) My plan now is to hide (NOINDEX) the thin pages.(http://moz.com/community/q/noindexing-thin-content-pages-good-or-bad)