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HTML 

              
                  <head><meta charset="utf-8">
    <title>Virus</title>
  </head>

  <body>
    <div class="wrapper">
      <canvas id="mycanvas"></canvas>
    </div>

    <script src="https://d28qoto45d39ov.cloudfront.net/datastorm/visualisations/virus/js/d3.min.js"></script>
    <script src="https://d28qoto45d39ov.cloudfront.net/datastorm/visualisations/virus/js/lodash.min.js"></script>
    <script src="https://d28qoto45d39ov.cloudfront.net/datastorm/visualisations/virus/js/requestanimframe.js"></script>
    <script src="https://d28qoto45d39ov.cloudfront.net/datastorm/visualisations/virus/js/datastorm-canvas.js"></script>

  </body>
!

CSS 

              
                html, body, .wrapper, svg {
  width: 100%;
  height: 100%;
  background-color: black;
}
!

JS 

              
                "use strict";
var datastorm = datastorm || {};

datastorm.virus = (function(){
  var my = {};

  var elements = {};

  var width, height;
  var active = true;

  var config = {};

  var nodes = [], links = [];

  var force = d3.layout.force()
    .charge(-800)
    .linkDistance(50)
    .linkStrength(function(d) {
      return d.strength;
    })
    .gravity(0.01)
    .friction(0.1);

  var timer;

  var ctx = datastorm.canvas.ctx;

  function init() {

    d3.select('canvas')
      .attr('width', config.width)
      .attr('height', config.height);

    force.size([config.width, config.height]);
  }




  function forceEnd() {
    // updatePositions();
    // updateNetwork();
  }

  function updateNetwork() {

    // Clone, otherwise adding nodes whilst iterating is not clever :)
    nodes = _.clone(datastorm.virus.sim.getUsers());
    links = _.clone(datastorm.virus.sim.getLinks());

    force.nodes(nodes)
      .links(links)
      .start();
  }

  function render() {
    ctx.globalAlpha = 1;

    ctx.fillStyle = "rgba(0, 0, 0, 0.6)";
    ctx.fillRect(0, 0, config.width, config.height);



    ctx.globalAlpha = 0.5;

    // Links
    ctx.strokeStyle = 'rgba(200, 200, 255, 0.7)';
    ctx.lineWidth = 0.5;

    _.each(links, function(d) {
      datastorm.canvas.drawLine(d.source.x, d.source.y, d.target.x, d.target.y);
    });

    // // Nodes
    // console.log('render', nodes.length);
    ctx.fillStyle = 'rgba(200,200,255,1)';
    _.each(nodes, function(d) {
      // console.log(d);
      // ctx.fillStyle = colorScale(d.subject * 2);

      var activeMessages = _.filter(d.messages, function(dd) {
        return dd.active;
      });

      var fill = '#ddd';

      var radius = 3;
      if(activeMessages.length > 0) {
        fill = activeMessages[0].color;
        radius = 6;
      }

      ctx.fillStyle = fill;

      datastorm.canvas.drawCircle(d.x, d.y, radius);
    });
  }

  function showMessages() {
    elements.svg
      .select('.nodes')
      .selectAll('circle')
      .each(function(d) {
        var activeMessages = _.filter(d.messages, function(dd) {
          return dd.active;
        });

        var fill = '#ddd';

        if(activeMessages.length > 0)
          fill = activeMessages[0].color;

        d3.select(this)
          .style('fill', fill)
          .attr('r', activeMessages.length > 0 ? 6 : 3);

      });
  }


  my.init = function(conf) {
    _.assign(config, conf);

    init();

  };

  my.start = function() {
    datastorm.virus.sim.start();
    setInterval(render, 100);
  }

  my.stop = function() {
    datastorm.virus.sim.stop();
  };

  my.networkUpdate = function() {
    updateNetwork();
  }

  return my;
}());

"use strict";
var datastorm = datastorm || {};

datastorm.virus.sim = (function(){
  var my = {};

  var timer;
  var users = [], /*messages = [],*/ links = [];
  var messageId = -1;

  var config = {
    addUserProbability: 0.2,
    addMessageProbability: 0.6,
    addFriendProbability: 1,
    repeatMessageProbability: 0.9,
    repeatMessageTimespan: 2000, // timespan (milliseconds) in which a message can be repeated
    maxUsers: 120
  };


  /*-----
  HELPERS
  -----*/
  function shouldDo(probability) {
    // Decide, based on the given probability, whether event should occur
    return Math.random() < probability;
  }

  function randomColor() {
    var color = d3.rgb(Math.random() * 255, Math.random() * 255, Math.random() * 255);
    color = color.toString();
    // console.log(color);
    return color;
  }

  /*----
  EVENTS
  ----*/
  function addUser() {
    if(!shouldDo(config.addUserProbability))
      return;

    if(users.length > config.maxUsers)
      return;

    var newUser = {
      id: users.length,
      chatty: 0.01 + 0.02 * Math.random(), // how often user messages
      friendly: 0.8 + 0.2 * Math.random(), // how likely user is to friend another user
      interesting: Math.random(), // how interesting the user's messages are
      subject: Math.floor(Math.random() * 10), // the user's interest area,
      friends: [],
      messages: [],
      // isMessaging: false,
      // isRepeatedMessage: false,
      // messageTime: null,
      // isRepeatingMessage: false,
      x: 0.5 * config.width + 10 * Math.random(), //TODO
      y: 0.5 * config.height + 10 * Math.random()//TODO
    };

    // console.log(newUser);
    users.push(newUser);
    datastorm.virus.networkUpdate();
  }

  function purgeMessages() {
    var now = Date.now();
    // messages = _.filter(messages, function(message) {
    //   return now - message.time < config.repeatMessageTimespan;
    // });

    _.each(users, function(user) {
      _.each(user.messages, function(m) {
        if(now - m.time > config.repeatMessageTimespan)
          m.active = false;
      });
      // user.messages = _.filter(user.messages, function(m) {
      //   return now - m.time < config.repeatMessageTimespan;
      // });
    });
  }

  function addMessage() {
    // Iterate through each user and make a message

    if(!shouldDo(config.addMessageProbability))
      return;

    _.each(users, function(user) {
      // console.log(user);

      // Throttle message creation (w/out changing globals)
      if(!shouldDo(0.05))
        return;

      if(!shouldDo(user.chatty))
        return;

      var now = Date.now();

      messageId++;

      var message = {
        id: messageId,
        originator: user.id,
        time: now,
        active: true,
        color: randomColor()
      };

      user.messages.push(message);
    });
  }

  function repeatMessage() {
    if(!shouldDo(config.repeatMessageProbability))
      return;

    var now = Date.now();

    _.each(users, function(user) {

      if(!shouldDo(4 * user.chatty))  // 4 times more likely to repeat a message?
        return;

      // console.log("looking at friends")

      // Go through each friend
      _.each(user.friends, function(friend) {

        // console.log('checking friend')

        if(!shouldDo(friend.interesting))
          return;

        // Go through each of friend's messages
        _.each(friend.messages, function(m) {

          if(!m.active)
            return;

          // console.log('checking messages')

          // check user hasn't already sent this one!
          var hasAlreadySent = false;
          _.each(user.messages, function(mm) {
            if(mm.id === m.id)
              hasAlreadySent = true;
          });
          if(hasAlreadySent)
            return;

          var reMessage = {
            id: m.id,
            originator: m.originator,
            time: now,
            color: m.color,
            active: true
          }
          user.messages.push(reMessage);

          // console.log('remessage!')
        });

      })
    });    
  }

  function addFriend() {
    if(!shouldDo(config.addFriendProbability))
      return;

    _.each(users, function(thisUser) {
      _.each(users, function(otherUser) {
        if(thisUser === otherUser)
          return;

        var probability = otherUser.chatty * thisUser.friendly * otherUser.interesting;

        // if(!shouldDo(otherUser.chatty))
        //   return;

        // if(!shouldDo(thisUser.friendly))
        //   return;

        // if(!shouldDo(otherUser.interesting))
        //   return;

        if(thisUser.subject !== otherUser.subject)
          probability *= 0.002;

        if(!shouldDo(probability))
          return;

        var alreadyFriends = _.find(thisUser.friends, function(friend) {
          return friend.id === otherUser.id;
        });
        if(alreadyFriends)
          return;

        // I don't think we have to do this reverse check...
        alreadyFriends = _.find(otherUser.friends, function(friend) {
          return friend.id === thisUser.id;
        });
        if(alreadyFriends)
          return;

        var strength = thisUser.subject === otherUser.subject ? 0.05 : 0.03;

        links.push({
          source: thisUser.id,
          target: otherUser.id,
          strength: strength
        });

        thisUser.friends.push(otherUser);
        otherUser.friends.push(thisUser);

        datastorm.virus.networkUpdate();


      });
    });
  }


  function update() {
    addUser();
    purgeMessages();
    addMessage();
    repeatMessage();
    addFriend();

    // console.log(users, messages, links);
  }

  my.init = function(conf) {
    _.assign(config, conf);
  };

  my.start = function() {
    timer = setInterval(update, 100);
  }

  my.stop = function() {
    clearInterval(timer);
  }

  my.getUsers = function() {
    return users;
  }

  my.getMessages = function() {
    return messages;
  }

  my.getLinks = function() {
    return links;
  }

  return my;
}());

(function(){

  var wrapper = d3.select('.wrapper');
  var width = wrapper.node().clientWidth;
  var height = wrapper.node().clientHeight;

  datastorm.virus.sim.init({
    width: width,
    height: height
  });
  datastorm.virus.init({
    width: width,
    height: height
  });

  datastorm.virus.start();

})();
!
999px

Console