As pointed out before - trying to find a face to face conversation, interactions and reactions, is far more preferable than people on their mobile phones.
I've taken a series of shots of these two guys at Borough Market - they work on two different stalls but have obviously built up a relationship based around their mutual cigarette cravings! This is the first of the 'contact sheet' that I've processed so far. Fringes of markets are often a good place to look for photo ops.