ecchi, at the risk of completely de-railing this thread:
Quote:
how long before Google trusts my new sites enough to take serious note in any PR they pass on
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Domain age isn't a factor when calculating PR. PR is a reflection of links pointing into your network. If you link from 100 PR 7 domains to a new domain, that domain will lose PR 0 as soon as Google crawls those links (in other words, in a matter of days, not months). Of course, you won't see the new PR until the next PR update, but that's irrelevant.
"Does the sandbox exist?" is a worthless debate; knowing that it exists or not won't help me get indexed any quicker. Like I said, trust seems to be the new buzzword when talking about deep crawling post BD, and domain age is a factor in sizing up trust.