What is the difference between a Real ID friend and StarCraft II friend?
Real ID friends on Battle.net can see each others full profiles, including real-life names, real-life profile information, and all of their characters across all Battle.net games. Both players must mutually agree to become real-life friends before either will appear on the others real-life friends list. To add a StarCraft II friend, simply enter a players character name. You will immediately start seeing that character in your friends list, but you will not be able to access real-life names, real-life profile information, or any other characters he or she might play. Other players are not notified if you add their characters to your friends list in this fashion.