This study showed that people who are more extraverted and/or less socially anxious preferred face-to-face and phone conversations, while people who were more introverted and more neurotic tended toward email:
…Consistent with these expectations, the reported results revealed that Extraversion and Neuroticism were significantly correlated with media preferences. Extraverts and participants low on Neuroticism more strongly preferred media with high-richness levels (face-to-face communication compared to e-mail) than introverts and individuals high on Neuroticism…
Source: “Do Shy People Prefer to Send E-Mail? Personality Effects on Communication Media Preferences in Threatening and Nonthreatening Situations” from Social Psychology 2008; Vol. 39(4):231–243
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