Knowing languages is all about making the first step in building intercultural bridges. Every language due to its historical way acquired some weight in politics, economy, geography, diplomacy - more. The tools we can use in getting what we want are growing in numbers like mushrooms after rain - e.g. www.eduget.com
But the main point stays in the fact that in this world of constant conflicts, misunderstanding each person should speak at least 2 languages so he or she will be able to see and test some event or fact from different sides. To prove this point it will be enough to check 2 or 3 version of one event in WIKI. The world is at war and the versions of stories are the battlefield. To my humble opinion, the non-verbal language is missing from the above-mentioned rank, as well as performance talk.