Blizzard’s Battle.net now has a global friends list
With the new global friends list, you can also chat with your friends in other parts of the world and even create full Battle.net groups with players from many different regions.
The list currently includes players from Europe, the Americas, and Asia, according to the patch notes from the desktop clientUnfortunately, it doesn’t seem that you can play anything with players from a different region at this point, but it’s at least nice to know what your friends are up to, even if they aren’t nearby