The Many Lives of William Klein
Some say that the purest form of photography is "street" photography. After watching this video, I agree. Like a famous photographer once said, "If your pictures aren't any good, you need to get closer to your subject."
That's where the "in your face " phrase comes from. I find that the photos I take that are close up ones usually reveal more character and if getting close doesn't work, use a telephoto lens. But if you both engage your subject to allow yourself permission to get into their space, then good photo opportunities will avail themselves
So, feel free to get in their face!