I never received any tweets regarding nonprofitforce. But you can submit that you'd like an App for NonprofitForce with your Constant Contact account in our Marketplace.
Sorry I don't have any other helpful information.
Marissa Rogers Community & Social Media Support
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My husband, who manages Non-Profit energy & utility cost , say's Yes! Nonprofitforce is a edition of salesforce. There is also an app called nonprofitforce. I never used it , I understand it is focused on Non-profits and their sales force.
