ÏňđïģǿŘǎvēń Wrote:besides adding every person on battle.net so see if they added you could get boring, no offense.

And that's the only way this concept would work, even if automated, it would be very laborious and long-winded.  And you would see no results quickly and the probability of you detecting a mutual from the 10000's of users online is scarce.  There's no other way to do it, its all server side.