To learn one or several, that is the question. I see some members are learning only one, and some are learning several foreign languages. In my opinion, it is more rewarding to stick to one and become excellent at it. By taking on several at once, one may end up speaking not much beyond simple greetings in each language. However, by sticking to one, one can communicate with people speaking that language on much deeper levels, and that's how meaningful and lasting friendships form.