This picture was posted almost a day ago near of iH8sn0w on his Twitter account and as the person who posted it says, the character in the picture would be MuscleNerd, the leader of the Dev Team who has been making decoding and jailbreak solutions for the iPhone for several years. If we are to compare this picture and the one from profile to MuscleNerd, then we could say that there is definitely a similarity in terms of the physiognomy of the body, but the fact that MuscleNerd could have put any kind of picture there must also be taken into account.
So, do you think he's a MuscleNerd or not?
UPDATED: It seems that the picture was mail by MuscleNerd on his TwitPic account in December 2008, so that person is indeed MuscleNerd.
