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We empirically study the motivations of users to contribute content to social media in the context of the
popular microblogging site Twitter. We focus on noncommercial users who do not benefit financially from
their contributions. Previous literature suggests that there are two main types of utility that motivate these users
to post content: intrinsic utility and image-related utility. We leverage the fact that these two types of utility
give rise to different predictions as to whether users should increase their contributions when their number
of followers increases. To address the issue that the number of followers is endogenous, we conducted a field
experiment in which we exogenously added followers (or follow requests, in the case of protected accounts)
to a set of users over a period of time and compared their posting activities to those of a control group. We
estimated each treated user’s utility function using a dynamic discrete choice model. Although our results are
consistent with both types of utility being at play, our model suggests that image-related utility is larger for
most users. We discuss the implications of our findings for the evolution of Twitter and the type of value firms
may derive from such platforms in the future.