diff --git a/public/global.css b/public/global.css
index e94a379..f54c683 100644
--- a/public/global.css
+++ b/public/global.css
@@ -141,6 +141,36 @@ a:hover, span.pseudolink:hover {
   background-color: #e24545a1;
 }
 
+/* polarization */
+.pol-l {
+  background-color: #2e64a0;
+  opacity: 0.8;
+}
+
+.pol-ll {
+  background-color: #61a3de;
+  opacity: 0.8;
+}
+
+.pol-c {
+  background-color: #96659e;
+  opacity: 0.8;
+}
+
+.pol-lr {
+  background-color: #a15552;
+  opacity: 0.8;
+}
+
+.pol-r {
+  background-color: #ca0800;
+  opacity: 0.8;
+}
+
+.pol-undef {
+  background-color: #e0d3e2;
+  opacity: 0.8;
+}
 
 /* the landing page */
 .page-wrapper {
diff --git a/src/components/EventTooltip.svelte b/src/components/EventTooltip.svelte
index 16a4525..a71a381 100644
--- a/src/components/EventTooltip.svelte
+++ b/src/components/EventTooltip.svelte
@@ -4,7 +4,7 @@
   import { width, panelHeight, controlsHeight } from '../stores/dimensions';
   import { tooltip } from '../stores/eventSelections';
   import { fade, slide } from 'svelte/transition';
-  import { timeFormat, format } from 'd3';
+  import { timeFormat } from 'd3';
   import { extractHostname } from '../utils/misc';
   import {
     platformFilter,
@@ -20,6 +20,8 @@
   import EventTooltipCross from './EventTooltipCross.svelte';
   import ScoreBar from './ScoreBar.svelte';
   import ScoreQuestions from './ScoreQuestions.svelte';
+  import ImpactStrip from './ImpactStrip.svelte';
+  import PolarizationLegend from './PolarizationLegend.svelte';
   import Share from './Share.svelte';
 
   const offset = {
@@ -32,7 +34,6 @@
 
   const attributionTf = timeFormat('%B %d, %Y');
   const activityTf = timeFormat('%B %Y');
-  const commaFormat = format(',');
 
   let elem;
   let tWidth, tHeight;
@@ -181,19 +182,19 @@
             <p>pending</p>
           {:else}
             <ul>
-              <li>
-                <span class="smi-score facebook">{commaFormat($tooltip.tp.smiFacebook)}</span>
-                <span class="smi-label">Facebook</span>
-              </li>
-              <li>
-                <span class="smi-score twitter">{commaFormat($tooltip.tp.smiTwitter)}</span>
-                <span class="smi-label">Twitter</span>
-              </li>
-              <li>
-                <span class="smi-score reddit">{commaFormat($tooltip.tp.smiReddit)}</span>
-                <span class="smi-label">Reddit</span>
-              </li>
+              <ImpactStrip value={$tooltip.tp.smiFacebook}
+                           polarization={$tooltip.tp.polarization}
+                           label="Facebook" />
+              <ImpactStrip value={$tooltip.tp.smiTwitter}
+                           polarization={$tooltip.tp.polarization}
+                           label="Twitter" />
+              <ImpactStrip value={$tooltip.tp.smiReddit}
+                           polarization={$tooltip.tp.polarization}
+                           label="Reddit" />
             </ul>
+            {#if ($tooltip.tp.polarization.fulfills10Articles || $tooltip.tp.polarization.fulfills25Percent)}
+              <PolarizationLegend />
+            {/if}
           {/if}
         </div>
         {#if ($tooltip.tp.imageUrl)}
@@ -426,26 +427,6 @@
     display: flex;
   }
 
-  .smi li {
-    margin: 0.2rem 0.3rem 0.2rem 0;
-    font-size: 0.8rem;
-  }
-
-  .smi-score {
-    padding: 0 0.2rem;
-    border: none;
-    border-radius: 3px;
-    box-shadow: 0 1px 2px rgba(0,0,0,0.07), 
-                0 2px 4px rgba(0,0,0,0.07);
-  }
-
-  .smi-label {
-    display: inline-block;
-    padding: 0 0.1rem;
-    border: none;
-    border-radius: 3px;
-  }
-
   a {
     text-decoration: none;
   }
@@ -458,11 +439,6 @@
     font-size: 0.6rem;
   }
 
-  .no-break {
-    word-break: keep-all;
-    white-space: nowrap;
-  }
-
   .scroll-wrapper .image {
     min-height: 1%;
     width: 100%;
diff --git a/src/components/ImpactStrip.svelte b/src/components/ImpactStrip.svelte
new file mode 100644
index 0000000..9d1498a
--- /dev/null
+++ b/src/components/ImpactStrip.svelte
@@ -0,0 +1,52 @@
+<script>
+  import { format } from 'd3';
+
+  import PolarizationStrip from './PolarizationStrip.svelte';
+
+  export let value = 0;
+  export let polarization;
+  export let label = '';
+
+  const commaFormat = format(',');
+
+  let valueWidth = 0;
+</script>
+
+<li>
+  <div class="smi-score {label.toLowerCase()}"
+        bind:clientWidth={valueWidth}>
+    {commaFormat(value)}
+  </div>
+  <span class="smi-label">
+    {label}
+  </span>
+  {#if ((polarization.fulfills10Articles || polarization.fulfills25Percent) && value > 0)}
+    <PolarizationStrip polarization={polarization[label.toLowerCase()]}
+                       smi={value}
+                       valueWidth={valueWidth} />
+  {/if}
+</li>
+
+<style>
+  li {
+    margin: 0.2rem 0.3rem 0.2rem 0;
+    font-size: 0.8rem;
+    min-width: 30%;
+  }
+
+  .smi-score {
+    display: inline-block;
+    padding: 0 0.2rem;
+    border: none;
+    border-radius: 3px;
+    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.07), 
+                0 2px 4px rgba(0, 0, 0, 0.07);
+  }
+
+  .smi-label {
+    display: inline-block;
+    padding: 0 0.1rem;
+    border: none;
+    border-radius: 3px;
+  }
+</style>
diff --git a/src/components/PolarizationLegend.svelte b/src/components/PolarizationLegend.svelte
new file mode 100644
index 0000000..d39f9cd
--- /dev/null
+++ b/src/components/PolarizationLegend.svelte
@@ -0,0 +1,52 @@
+<script>
+  import { categories } from '../inputs/polarization';
+</script>
+
+<div class="pol-legend">
+  <p>Polarization:</p>
+  <ul>
+    {#each categories as category (category)}
+      <li>
+        <div class="pol-legend-field pol-{category.id}"></div>
+        <p>{category.name}</p>
+      </li>
+    {/each}
+  </ul>
+</div>
+
+<style>
+  .pol-legend {
+    display: flex;
+    align-items: center;
+    font-family: var(--font-02);
+    color: var(--dfrlab-gray);
+  }
+
+  .pol-legend p {
+    margin-right: 0.7rem;
+    font-size: 0.7rem;
+  }
+
+  .pol-legend ul {
+    display: flex;
+    align-items: center;
+    height: 100%;
+    list-style-type: none;
+  }
+
+  .pol-legend ul li {
+    display: flex;
+    align-items: center;
+    height: 100%;
+  }
+
+  .pol-legend ul li p {
+    font-size: 0.6rem;
+  }
+
+  .pol-legend-field {
+    width: 0.5rem;
+    height: 0.5rem;
+    margin-right: 0.2rem;
+  }
+</style>
diff --git a/src/components/PolarizationStrip.svelte b/src/components/PolarizationStrip.svelte
new file mode 100644
index 0000000..fb0d7b9
--- /dev/null
+++ b/src/components/PolarizationStrip.svelte
@@ -0,0 +1,108 @@
+<script>
+  import { categories } from '../inputs/polarization';
+
+  import { scaleLinear, line as d3line, curveBasis } from 'd3';
+
+  export let polarization;
+  export let smi = 0;
+  export let valueWidth = 0;
+
+  const magnifierHeight = 20;
+
+  const margin = {
+    top: 4,
+    right: 2,
+    bottom: 0,
+    left: 2
+  };
+
+  const yScale = scaleLinear()
+    .domain([0, 1])
+    .range([margin.top, magnifierHeight - margin.bottom]);
+
+  const line = d3line()
+    .x((d) => d[0])
+    .y((d) => yScale(d[1]))
+    .curve(curveBasis);
+
+  let width;
+  let stack = {};
+
+  $: totalEngagement = Object.keys(polarization).map((k) => polarization[k]).reduce((acc, cur) => acc + cur);
+  $: engagementExplained = totalEngagement / smi;
+
+  $: Object.keys(polarization).forEach((k) => {
+      const value = polarization[k];
+      stack[k] = {
+        value,
+        width: Math.floor(100 * value / totalEngagement, 2)
+      };
+    });
+
+  $: leftPathData = [
+    [margin.left + valueWidth / 2 - engagementExplained * valueWidth / 2, 0],
+    [margin.left + valueWidth / 2 - engagementExplained * valueWidth / 2, 0.3],
+    [margin.left, 0.7],
+    [margin.left, 1]
+  ];
+
+  $: rightPathData = [
+    [valueWidth / 2 + engagementExplained * valueWidth / 2 - margin.right, 0],
+    [valueWidth / 2 + engagementExplained * valueWidth / 2 - margin.right, 0.3],
+    [width * 0.98 - margin.right, 0.7],
+    [width * 0.98 - margin.right, 1]
+  ];
+</script>
+
+<div class="polarization-strip"
+     bind:clientWidth={width}>
+  <svg class="pol-magnifier"
+       width={width}
+       height={magnifierHeight}>
+    <path d={line(leftPathData)} />
+    <path d={line(rightPathData)} />
+    <text x={valueWidth / 2}
+          y={yScale(1)}>
+      {Math.round(engagementExplained * 100)}%
+    </text>
+  </svg>
+  <div class="pol-layer-wrapper">
+    {#each categories as category (category.id)}
+      <div class="pol-layer pol-{category.id}"
+           style="width: {stack[category.id].width}%;">
+      </div>
+    {/each}
+  </div>
+</div>
+
+<style>
+  .polarization-strip {
+    width: 100%;
+  }
+
+  path {
+    stroke: var(--dfrlab-gray);
+    stroke-width: 1.5;
+    stroke-dasharray: 2 3;
+    stroke-linecap: round;
+    fill: none;
+  }
+
+  text {
+    font-family: var(--font-02);
+    font-size: 0.6rem;
+    text-anchor: middle;
+    fill: var(--dfrlab-gray);
+  }
+
+  .pol-layer-wrapper {
+    width: 100%;
+    height: 1rem;
+    border: none;
+  }
+
+  .pol-layer {
+    display: inline-block;
+    height: 100%;
+  }
+</style>
diff --git a/src/inputs/polarization.js b/src/inputs/polarization.js
new file mode 100644
index 0000000..993ec3c
--- /dev/null
+++ b/src/inputs/polarization.js
@@ -0,0 +1,22 @@
+export const categories = [
+  {
+    id: 'l',
+    name: 'left'
+  },
+  {
+    id: 'll',
+    name: 'leanleft'
+  },
+  {
+    id: 'c',
+    name: 'center'
+  },
+  {
+    id: 'lr',
+    name: 'leanright'
+  },
+  {
+    id: 'r',
+    name: 'right'
+  },
+];
diff --git a/src/utils/loadData.js b/src/utils/loadData.js
index 8604002..bba4d1a 100644
--- a/src/utils/loadData.js
+++ b/src/utils/loadData.js
@@ -92,21 +92,21 @@ const loadData = async () => {
           lr: +d.allsides_engagments_leanright,
           r: +d.allsides_engagments_right
         },
-        fb: {
+        facebook: {
           l: +d.allsides_engagments_left_facebook,
           ll: +d.allsides_engagments_leanleft_facebook,
           c: +d.allsides_engagments_center_facebook,
           lr: +d.allsides_engagments_leanright_facebook,
           r: +d.allsides_engagments_right_facebook
         },
-        tw: {
+        twitter: {
           l: +d.allsides_engagments_left_twitter,
           ll: +d.allsides_engagments_leanleft_twitter,
           c: +d.allsides_engagments_center_twitter,
           lr: +d.allsides_engagments_leanright_twitter,
           r: +d.allsides_engagments_right_twitter
         },
-        re: {
+        reddit: {
           l: +d.allsides_engagments_left_reddit,
           ll: +d.allsides_engagments_leanleft_reddit,
           c: +d.allsides_engagments_center_reddit,