This little "quick & dirty" writed counts the number of characters of your tweets.

nb_chars.js

/*
 * This little "quick & dirty" writed counts the number of characters of your tweets.
 * Ce petit script codé rapidement et salement compte le nombre de caractères de vos tweets.
 *
 * How to use?
 * 1) Download your Twitter archive
 * 2) Install Node.js
 * 3) Install the csv module, type: "(sudo) npm install csv"
 * 4) Put this script in the uncompressed folder of your Twitter archive
 * 5) Run the script, type "node nb_chars" in your terminal
 * 6) Have fun with VERY useful stats. lulz.
 *
 * Comment l'utiliser ?
 * 1) Téléchargez votre archive Twitter
 * 2) Installez Node.js
 * 3) Installez le module "csv", pour cela, tapez "(sudo) npm install csv"
 * 4) Mettez ce script dans le dossier décompressé de votre archive Twitter
 * 5) Lancez le script en tappant "node nb_chars" dans votre terminal
 * 6) Et hop', du charabia s'affiche à l'écran, c'est le résultat.
 *
 * CC-BY - Alexis Delrieu
 */

console.time("delta time");

var csv = require("csv");

var nb = {
    chars                   : 0
    , charsWithoutMentions  : 0
    , mentions              : 0
    , tweetsWithMention     : 0
    , tweets                : 0
}

csv()
    .from.path(__dirname +"/tweets.csv")
    .on("data", function (data){
        nb.tweets++;
        data = data.split(",")[5]
        var words = data.split(" ");
        var hasMention = false;
        words.forEach(function (word){
            if (word[0] == "@"){
                nb.mentions++;
                if (!hasMention){
                    hasMention = true;
                    nb.tweetsWithMention++;
                }
            } else {
                nb.charsWithoutMentions += word.length + 1;
            }

            nb.chars += word.length + 1;
        });
    })
    ;

process.on("exit", function (){
    console.log(nb.chars +" characters");
    console.log(nb.charsWithoutMentions +" characters if we do not count the mentions")
    console.log(nb.mentions +" total mentions (@)");
    console.log(nb.tweetsWithMention +" tweet with one mention (@) or more");
    console.log(nb.tweets +" tweets");
    console.log((nb.chars / nb.tweets) +" avg chars in a tweet");

    console.timeEnd("delta time");
});