This document compares influencers and ambassadors. It outlines that: Influencers are bloggers, celebrities, YouTubers and Instagramers who are hired and motivated by growing their audience, while ambassadors are very satisfied customers and evangelists who are invited and motivated to help their friends. Influencers carry messages and support campaigns in the short-term, while ambassadors carry missions and sustain conversations in the long-term. Both need different incentives like remuneration versus recognition, and have short versus long-term loyalty to brands. Influencers are needed to kick start products while ambassadors sustain product life cycles.