Twitter isn't a public company just yet, but its updated S-1 filing hit today and showed how it's grown in the last three months. While it showed 218 million monthly active users by the end of June, its Q3 stats have grown to 232 million (53 million of them are in the US). While the number of users accessing the service from mobile devices grew slightly from 75 to 76 percent, ad revenue on mobile grew 37 percent since the last report, compared to other revenue which was up 9 percent. It's making more money too, with revenue for the quarter of $168.6 million, up from $139 million in Q2 and $82 million for the same period last year. If you want to invest in the right stock at its IPO, look for TWTR on the NYSE -- until then prospective investors can dig through the financial data here and follow the @TwitterIR account for updates.