How many languages do you speak?

Just out of curiosity:

1) How many?
2) What do you use them for?
3) Of those that you know how to speak, which one is your favourite and why?
4) Have you ever been given preferential treatment in any way just because you could speak more than one language?
5) Do you think that knowing more than language is nowadays an advantage?

I could go on with the questions, but enough for now!