The answer to most of your questions largely depends on how you choose to set up the integration.
You choose the sync name itself, which contact types you're pulling from on the Salesforce side, the contact fields you want synced, whether you're "merging" or "overwriting," how often the sync should occur, and which lists you're adding to on the Constant Contact side.
Any contacts added via the integration will be explicitly marked as such in their source (if they weren't already added by another means). As far as filtering out your Salesforce unsubscribes, that will depend on whether you have them under your contacts and/or leads lists on that side.
I'd definitely recommend going through that article in full to understand how the integration works, and how to set it up so it's syncing as efficiently for your needs and management as possible. Beyond that, if you run into any issues, I'd advise calling our general support and asking to speak with the Tier 2 integrations team for additional assistance and insight.
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