In this talk, the speaker discusses the importance of building external evangelists in the DevRel and open source community. They emphasize the need to measure the external advocates or evangelists created as a metric for community and DevRel success. The speaker highlights the expectations companies have from community DevRel efforts and how those efforts can lead to more contributors, users, and customers. They also discuss the need to scale DevRel efforts by plugging into different tribes or communities. The speaker provides various ways to build external evangelists, including hiring influencers, growing the user base, creating content, being authentic, making connections, being transparent, and listening to the community. The speaker emphasizes the importance of setting reasonable expectations, avoiding common mistakes, practicing best practices, and building relationships in the community. They conclude by providing resources and inviting attendees to connect with them.