Efficiency of Human Activity on Information Spreading on Twitter

TL;DR

This paper introduces a measure of efficiency in information spreading on Twitter, analyzing how user interactions and network structure influence collective reactions and identifying influential users who achieve high impact with less effort.

Contribution

It defines and quantifies efficiency in Twitter information spread, and presents a model linking network topology to user influence and message dissemination effectiveness.

Findings

Efficiency is universal across Twitter conversations.

A small fraction of users are highly efficient in spreading information.

Network heterogeneity explains the emergence of highly efficient users.

Abstract

Understanding the collective reaction to individual actions is key to effectively spread information in social media. In this work we define efficiency on Twitter, as the ratio between the emergent spreading process and the activity employed by the user. We characterize this property by means of a quantitative analysis of the structural and dynamical patterns emergent from human interactions, and show it to be universal across several Twitter conversations. We found that some influential users efficiently cause remarkable collective reactions by each message sent, while the majority of users must employ extremely larger efforts to reach similar effects. Next we propose a model that reproduces the retweet cascades occurring on Twitter to explain the emergent distribution of the user efficiency. The model shows that the dynamical patterns of the conversations are strongly conditioned by the topology of the underlying network. We conclude that the appearance of a small fraction of extremely efficient users results from the heterogeneity of the followers network and independently of the individual user behavior.