i agree with juv- a wave or smile something like that or just a look, also if you know they have the same interests as you then you can just talk to them about that automatic convo. But I'm a really shy person so its always been hard for me to make friends esp. of the opposite sex. But since i have a boyfriend other guys dont intimidate me and ive been able to make lots of new friends, then i introduce the guys to my girl friends and non of them talk to me anymore
