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because "Hey its my friend '12345678' doesn't roll of the tongue? an 8-digit id number (to support all the 10 mil+ accounts, possibly even 9 digits as we move to diablo 3 and starcraft 2 being added) doesn't make the Identification of your friends any easier.
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This isn't what he means by a unique identifier number. In steam there is a unique ID number tied to every account this number has no effect on your visible name. What is meant by this is because the realid system is showing your "character" name or real name it doesn't show your email. The only person who knows that info is the person you gave it to to allow them to become a real id friend. So It would tell you friend John Doe is playing Starcraft 2. Even if his unique number is 12345678 this is internal to the system to keep track of each player and in no way a display name.