I can't remember where I read or heard this (probably Nick Sparks), but it's sort of a "challenge" - you make eye contact with a person, count to three, look away (or approach) It's really fun because you can get a really good read on people and know who's approachable. Give it a shot
I've been doing this because I tried cold approaches a while back and realized I suck and they're probably not my thing...at least until I practice more and develop my skills. I've been speaking too fast (in my opinion), moving around more than I'd like to, and running out of things to say way too early. Eye contact has never been an issue.
Nick Sparks has some really great lectures on YouTube about "holding conversations like a man." He gets into body language and alpha posturing. I found that really helpful and I recommend you all check it out.