Email response time is positively related to tie strength

Stefan Wuchty and Brian Uzzi at Northwestern have published

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a rigorous paper suggesting that besides volume and reciprocal exchange, response time can help identify different types of ties in one’s social networks.

The Wall Street Journal coverage is here: E-Mail Separates Friends from Acquaintances.

The Science Now coverage is here: E-mail Reveals Your Closest Friends.

The original research paper is

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here: Human Communication Dynamics in Digital Footsteps: A Study of the Agreement between Self-Reported Ties and Email Networks.