I'm not saying that I disagree (because I do think that Hindi is probably number 2), but that list is over 10 years old and is just an estimation. More telling

I'm not saying that I disagree (because I do think that Hindi is probably number 2), but that list is over 10 years old and is just an estimation. More telling is that from that same estimation, English is the number of secondary speakers of languages. French was number one, followed closely by English. I'm guessing that by now English has pulled ahead.