Blizzard recently released Starcraft 2 for several different regions which mean that not everyone can play the game together. Blizzard just announced that in the coming months, they will be introducing Global Play in an upcoming patch.
Global Play will allow players to switch between regions while retaining their own game language and user interface. Even though you will be playing in another region, your character, profiles, stats and ladder positions will not carry over from region to region, which means that switching regions would be a fresh start.
Blizzard will be releasing more information on Global Play soon but we think that they should try to fix that part because nobody we know would want to start over just to play with a friend across the globe.