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Hi Kevin; You should use Volusion to Magento migration tool from Litextension to get your job done. This tool supports migration full data including URLs from Volusion to Magento and you wont lost your search ranking. I think Litextension provides the best solution to keep old urls after change to Magento, you can read their solution at this blog post. watch?v=BSFtOzYzD2Q

I checked the following Curebit URL, which goes to Busted Tees: http://www.curebit.com/x/bgTxdO This URL 302 redirects to http://www.bustedtees.com/?utm_source=Curebit&utm_medium=Referral&utm_campaign=Rebate, which then has a 200 status code. What this means is that there will be no page-rank flowing through to the destination URL. So no it does not "count" in that way. However, I have no idea whether the social shares portion of Google's algorithm, and I assume there is one, looks at 302 and 301 redirects differently than the part that calculates pagerank for organic search results.