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Yes, they are! I haven't seen changes like this many months.
Someone mentioned Google's monthly updates, it would be nice if they did update monthly... But who is going to update with one month's worth of data? Not me, and certainly not Google.
I'm back in the SERPs (for the moment), but I don't see cutting edge here, I see a blind man trying to find his way around the living room after somebody rearranged his furniture without telling him.
This new in and out thing is horrendous, what ever happened to moving up and down each month?
This behaviour during updates is far from new. You only need to look at Google update threads over the past several years to discover that it takes a while for the various data centers to settle down.
Do a site search for Google update and take a look. Be patient, we may still be seeing fluctuations for another week or it could settle down by tomorrow. Its anyone's guess.
It seems that Google is way way way overcompensating for the elimination of wikipedia's ability to have a hub score (due to its outbound links now being no-follow)... OR... the effect of no-follow has HUGELY boosted the wikipedia PR and thus raised the rankings for its indexed pages.
There should be a name for your inbound links that do not have the nofollow attribute. ('Net Inbound Links', 'Natural Inbound Links', 'Inbound Links According to the Gospel of Google') Any ideas?