morningstar
Cathlete
I think it depends on the city you live in. In general, Toronto is not a friendly city that way- you smile at someone on the street and you take the risk that they follow you home. If I'm not in the middle of a hard sprint I will sometimes (rarely, really) smile at another female runner as she goes by, but usually all the runners on the streets are all very focused on what we are doing and paying too much attention to not running into anything or anyone to be smiling, waving or talking. I am always irritated by everyone in my way, and wish that I had all the streets to myself, so I'm not really a friendly person during my runs, as gregarious as I am otherwise. That's why I run at 6:00am- less people to have to swear at!