I started taking my FREE ADVICE sign to coffee shops and public spaces in 2008. Since then, I've talked to hundreds of people in person and via video chat about, well, just about everything. In sum, I've learned more from them than they have from me.
Most of the impetus behind social projects like this is as simple as wanting to do something a little different, to interact with the world in a lightly different way. Yes, you hope to have some small impact now and again, but mostly you're just playing, having fun ... part of the every single day fight against monotony and routine ... part of the everyday fight to learn something new from someone new as often as possible.