Daily proportion of @-mentioned users which are located within a tag city.

<p>Noise is eliminated by smoothing with a 4.</p

Daily volumes of Tag Challenge related Tweets and Web hits on http://www.tag-challenge.com up to the challenge day. Major media coverage events are highlighted.

<p>Daily volumes of Tag Challenge related Tweets and Web hits on <a href="http://www.tag-challenge.com" target="_blank">http://www.tag-challenge.com</a> up to the challenge day. Major media coverage events are highlighted.</p

Distance convergence toward Tag Challenge cities of web hits on http://www.tag-challenge.com.

<p>We consider a moving average of distance filtered daily tweet traffic (MA(prop(t))) (grey circles), which is fit with a linear regression (red line) giving a correlation of .</p

The total daily number of Tweets (black line), the number targeting individuals via @-mentions (blue line) and their proportion (red line).

<p>Correlation of targeted proportion with time was found as .</p

Map showing communication network within Europe and North America following an unbiased random walk (upper) and under 30% targeting (lower).

<p>The area of red circles are proportional to centrality.</p

Plot of stationary distribution during a random walk on global MSA network, with increasing degree of greediness (targeting) moving clockwise from top left.

<p>The red line represents an pure, untargeted random walk, corresponding to pure random mobilization via broadcast messaging. (Top left) The horizontal dashed line represents the uniform distribution of centralities expected in a fully connected graph. The black line in other plots represents a greedy random walk. (Bottom right) When the greediness is increased to we match the observed proportion of targeted messages reaching the Tag Challenge cities. The shading represents MSAs from different continents. The 5 tag cities are marked with vertical, dashed blue lines.</p

Daily proportion of @-mentioned users which are located within a tag city.

<p>Noise is eliminated by smoothing with a 4.</p

Daily number of impressions on Facebook for the winning team CrowdscannerHQ, and the official Tag Challenge organizers.

<p>The vertical dotted line denotes the release of the first mug shots.</p