Sport diplomacy. It's a concept that I think is brilliant and I want to learn more about. Every two years during the Olympics there's a sense of international warmth and goodwill for a few weeks - it's hard not to notice. Sports transcend language, culture, and politics and can bring together enemies and/or those with whom a society may have nothing in common - save for the love of a sport and the common experience that goes with it, whether participating or just being a fan.
Obviously, sport diplomacy can ease tensions and put more lighthearted spirit on serious disagreements between nations. But, as mentioned in the blog post I linked to, it can be an effective tool of public diplomacy on a grassroots level as well, by putting people on an even playing field (pun very much intended). Instinct says that sport diplomacy would place more emphasis on competition, but in reality it's the simpler things in life that serve to bond people across borders and cultures.