This document provides best practices for peer-to-peer (P2P) fundraising campaigns. It discusses advantages of P2P over traditional fundraising, including empowering supporters to fundraise from their own networks in a personal way. The document outlines three key ingredients of successful P2P campaigns: making the fundraising desirable through fun activities and rewards; ensuring the campaign is feasible through clear, achievable goals; and emphasizing the viability of the cause through clear impact messaging. It also presents a framework using desirability, feasibility and viability lenses to design effective P2P fundraising campaigns.