If you're looking for a New Year's resolution how about this one: make more eye contact with strangers.
I was reading this powerful little list of Twenty Lessons from the 20th Century by some Professor of History. One idea that struck me is a very simple one:
11: Make eye contact and small talk. This is not just polite. It is a way to stay in touch with your surroundings, break down unnecessary social barriers, and come to understand whom you should and should not trust.
In a large city like the one I live in, eye contact and small talk are rare. They're even rarer thanks to smartphones, of course - although, twenty years ago, Londoners were still avoiding each other, but using newspapers, novels and Gameboys instead. Anyway I do think smartphones create a mode of interaction which reduces incidental eye contact etc.
So I decided to take the advice. Over the past month or so I took those little opportunities - at the bus stop, at the pedestrian crossing, at the supermarket. A bit of eye contact, a few words about the traffic or whatever. I was surprised how many opportunities for effortless (and not awkward!) tiny bits of smalltalk there were and how worthwhile it was to take them. After the year we've had, this is a little tweak you can try, and who knows, it might help.