Såg detta på Matt Cutts blog (som Jim Westergren postade om på annan plats). Kanske ingen nyhet för er, men jag tyckte det var upplysande:
Citat:
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What is an update? Google updates its index data, including backlinks and PageRank, continually and continuously. We only export new backlinks, PageRank, or directory data every three months or so though. (We started doing that last year when too many SEOs were suffering from “B.O.”, short for backlink obsession.) When new backlinks/PageRank appear, we’ve already factored that into our rankings quite a while ago. So new backlinks/PageRank are fun to see, but it’s not an update; it’s just already-factored-in data being exported visibly for the first time in a while.
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http://www.mattcutts.com/blog/whats-an-update/