The average percentage of difference (forecast error) for each state (2011 to 2014).

<p>The average percentage of difference (forecast error) for each state (2011 to 2014).</p

Map of social media using the keyword “HIV” in the United States.

<p>Image from UCIPT’s HIV ChatterMap tool.</p

Results of using Google Trends-based model to predict new HIV case diagnoses from 2011–2014.

<p>Results of using Google Trends-based model to predict new HIV case diagnoses from 2011–2014.</p

Average coefficient of each variable (excluding control variables) and the proportion of states in which the variable is significant.

<p>Average coefficient of each variable (excluding control variables) and the proportion of states in which the variable is significant.</p

The distributions of the number of being cited and citing others.

<p>(A) being cited; (B) citing others; (C) citing and being cited; (D) all.</p

The topological properties of the HFS group.

<p><i>N</i>: number of nodes; <i>L</i>: number of links; Δ: network density; <i>NC</i>: number of components; <i>NG</i>: number of nodes in the giant component; <i></i>: average degree; <i>C</i>: average clustering coefficient; <i>l</i>: average shortest path length; <i>D</i>: network diameter; <i>λ_in</i>: power of in-degree distribution; <i>λ_out</i>: power of in-degree distribution; <i>r</i>: total degree assortativity coefficient; <i>r_in</i>: in-degree assortativity coefficient; <i>r_out</i>: out-degree assortativity coefficient.</p

Key HFS participants according to PageRank and HITS.

<p>Key HFS participants according to PageRank and HITS.</p

The temporal fluctuations of the citations from 2005 to 2010.

<p>The temporal fluctuations of the citations from 2005 to 2010.</p

A typical HFS participant network.

<p>(A) with casual nodes, and (B) without casual nodes.</p

Platforms for HFS.

<p>Platforms for HFS.</p