martinacastro - 7:29 pm on Feb 22, 2011 (gmt 0)

@Tedster,

about your comment

Anyone notice anything dramatic changing on Feb 15 (last Tuesday)?

One of my sites drop 170 positions for 2 very competitive keywords (K1, K2) on Feb 16 and stay in the same position (for other keywords composed by K1 or K2) or drop 5 or 8 positions for some other different keywords and the traffic decrease ~25%.

Since sunday this site improve their rankings in ~70 positions for these Kws (K1,K2).

Regards