Bubble chart visualising the 100 most frequently used words in tweets in the #KidneyStones online discussion on Twitter. SalemJohannes BorgmannHendrik BultitudeMatthew FritscheHans-Martin HaferkampAxel HeidenreichAxel MiernikArkadiusz NeisiusAndreas KnollThomas ThomasChristian TsaurIgor 2016 <p>The larger the bubble, the more a word is used. Colours only aid differentiation and have no other significance.</p>