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Our empirical study of the crowdfunding platform Ulule reveals the existence of a transversal social network at the platform scale. This social network has a catalyzing effect on crowdfunding campaigns. The results highlight five sub-groups of contributors within the social network—sponsors, followers, precursors, specialists, and collaborative specialists. Then, the analysis underlines a global and positive impact of the social network on the success rate. This positive influence becomes even more significant in the presence of sub-groups of contributors characterized by some thematic specialization and higher rates of collaboration.