Table 1. The second column reports the official data from the Italian Interior Minister; these data, taken from http://elezionistorico.interno.it/index.php?tpel=C, have been attached in the Supplementary Information.
| Party | Votes | Votes (%) | T 1 (%) | T 2 (%) | T 10 (%) |
| M5S | 8,691,406 | 25.26 | 22.4 | 20.0 | 16.9 |
| PD | 8,646,034 | 25.43 | 22.3 | 22.9 | 21.1 |
| PDL | 7,332,134 | 21.56 | 25.2 | 25.7 | 26.0 |
| SC | 2,823,842 | 8.30 | 13.7 | 14.3 | 13.1 |
| Small | 3,914,229 | 11.51 | 16.4 | 17.1 | 23.0 |
| Others | 2,598,110 | 7,64 | – | – | – |
The total number of voters is 35,270,926 from which we have to remove 1,265,171 not “valid votes” (359,279 of which left blank). The percentage are then computed on the total of 34,005,755 “valid” votes. All the above figures do not take into consideration the region “Valle d'Aosta”. As reported above in “Small” we aggregated the votes of the Lega, Futuro e Libertà, Unione Di Centro, Fratelli d'Italia, Sinistra Ecologia e Libertà. For this reason the numbers do not equal the total number of votes, nor do the percentages add up to 100 but rather to 92.34. In other words, other minor parties are missing and have been not monitored on Twitter. From the third column we present the percentage of votes and then the percentage of tweets at 1, 2 and 10 days before elections.