I've noticed that traffic on my favorite site (and a few others) has spiked recently:
Why has this happened and is it going to last?
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Google tweaked their search algorithm yesterday:
(More info here on The Register).
Interestingly it only seems to have affected some sites: and that doesn't include SO:
Is it going to last?
Unfortunately there is no way of knowing, but yes, it might - it's not like a burst of traffic you might get from a link on somewhere like reddit that'll be gone in a couple of days.