that's simply amazing! it allows you to know more about the world, different cultures, different habits, foods, religions and so on... you gain some more awareness and also friends!

Same as any other friendship. By the way "What do you think about...?" is the correct way to speak.

I have just got back from France and I think that it's wonderful that I was able to meet people from all over the world and immerse myself in the French language and culture.

It's one of the best ways of learning about cultures and languages, and allows you to obtain an insight that is otherwise, I believe, virtually impossible to gain.