15 Using Twitter to Learn about the Autism Community by the corresponding font size. We used a linear scale, the font size thus being proportional to the corresponding word’s frequency in a data set. (a) ASD ‘word-cloud’ (b) Control ‘word-cloud’ Fig. 5: The most frequent words in the (a) ASD and (b) control data sets, shown as so- called ‘word-clouds’. The font size used to display a particular word is proportional to the corresponding word’s frequency in the data set. As readily observed from Fig. 5 the most commonly used words in the two groups of tweets reveal a substantial difference in the nature of discussed topics. A more thorough examination reveals even further meaningful patterns coherent with the existing literature on ASD. In particular, observe the presence of a large number of words in the plot corre-