User Generated Content platforms such as YouTube are emerging as popular online communities. With tons of content generated every second worldwide, identifying factors that influence content popularity becomes an important issue. The contributor experience has been studied as a predicting factor of content popularity but its relationship with popularity is not consistent. Drawing on a dataset from Bilibili.com, we investigate the influence of contributor experience on content popularity from a perspective of novelty. Further, we investigate how this effect is moderated by different contributor identities. Our results show that contributor experience has a negative effect on content popularity, and institutional contributor identity weakens this effect while personal verification strengthens it. Our research results provide important implications for both platform operators, content contributors, and users.