CSR partnerships have evolved and taken various forms as companies and nonprofit organizations work toward creating societal change for the public good. This study examined public relations advocacy in the context of CSR communication through a 2 x 2 online experiment with a sample of 240 participants. Specifically, this study examined interactions between CSR fit, stage of partnership, and individuals’ activism levels on individuals’ attitude toward a company, a nonprofit, and skepticism levels toward the CSR partnership. High fit and philanthropic stage of partnership became significant factors on attitude toward the company. Individuals’ activism levels had a positive interaction with stage of partnership in predicting skepticism toward the partnership. Theoretical implications and practical applications for public interest communications are discussed.