These guys providing some treats or something else for Goku, he seems to like the socialising..
oopsey.. just noticed your post now, although it's a fairly "old" one..
I probably wouldn't socialize him by allowing people to give him stuff, maybe not even touch him. Just having him stay around people. Just that. That is mainly because I wouldn't want him to be too friendly and maintain a certain degree of "unfriendliness" towards people he doesn't know. Man I love they way they do that with the Fila, the more aggressive the dog is towards the judge in a show, the better the judge actually sees the dog, hehe...