Updating dates in an update query
New, unconfirmed Google ranking update ‘Fred’ shakes the SEO world (SEL)Did Google’s Fred update hit low-value content sites that focus on revenue, not users?
(SEL) Algorithm changes beginning on February 1st continued for a full week, peaking around February 6th (some reported the 7th).
(SER) The second phase of Penguin 4.0 was the reversal of all previous Penguin penalties.
This seemed to happen after the new code rolled out, and may have taken as long as two weeks.
The first phase of Penguin 4.0, which probably launched around September 22-23, was the rollout of the new, "gentler" Penguin algorithm, which devalues bad links instead of penalizing sites.