Well interesting thread but I'm not going to get into the "to greet or not to greet" aspect of it since basically it's a personal choice IMHO and for myself some days I'm more friendlier than others.....
I just thought I would share this with you if you missed it on google because it's rather informative:
http://www.bicyclesource.com/bicycling_glossary#poser
Enjoy and just ride I rather suspect if any of yous needed help on the road/trail or path a fellow cyclist or two would stop and make sure you're okay at least that's what I choose to believe but then again I believe I will win the lottery SOON too.
Ride on and keep the rubber side down!
Life is like a 10 speed bike, we all have gears we never use.
Charles Schultz
"The bicycle is just as good company as most husbands and, when it gets old and shabby, a woman can dispose of it and get a new one without shocking the entire community." — Ann Strong, Minneapolis Tribune, 1895