Reading the article and the comments made it more clear to me. Twitter is using some minification tool (maybe Google Closure) which attempts to reduce the numbe

Reading the article and the comments made it more clear to me. Twitter is using some minification tool (maybe Google Closure) which attempts to reduce the number of characters used. Using commas you can reduce two characters by avoiding some brackets. if(true){dothis();dothat();} if(true)dothis(),dothat();