Ask HN: Does FB technical interview accept Ruby?

So, I went to the second phase of the facebook recruitment process but lately I've been mostly coding ruby, javascript and playing with functional programming.

Even though I did code a lot of C/C++ in college, I don't really feel that much confident with it.

Is it ok to use Ruby? Some problems expect me to be in a typed language or some sort of stuff, does facebook take that into account?

Thanks.