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Objective   We examine individuals’ ability to detect social bots among Twitter personas, along with participant and persona features associated with that ability.Background   Social media users need to distinguish bots from human users. We develop and demonstrate a methodology for assessing those abilities, with a simulated social media task.Method   We analyze performance from a signal detection theory perspective, using a task that asked lay participants whether each of 50 Twitter personas was a human or social bot. We used the agreement of two machine learning models to estimate the probability of each persona being a bot. We estimated the probability of participants indicating that a persona was a bot with a generalized linear mixed-effects model using participant characteristics (social media experience, analytical reasoning, and political views) and stimulus characteristics (bot indicator score and political tone) as regressors.Results   On average, participants had modest sensitivity (d’) and a criterion that favored responding “human.” Exploratory analyses found greater sensitivity for participants (a) with less self-reported social media experience, (b) greater analytical reasoning ability, and (c) who were evaluating personas with opposing political views. Some patterns varied with participants' political identity.Conclusions   Individuals have limited ability to detect social bots, with greater aversion to mistaking bots for humans than vice versa. Greater social media experience and myside bias appeared to reduce performance, as did less analytical reasoning ability.Application   These patterns suggest the need for interventions, especially when users feel most familiar with social media.

Duped by Bots: Why Some are Better than Others at Detecting Fake Social Media Personas