You just know that the scowling Lycra warriors are fuming that I am screwing up their Strava segment rankings! I could care less, I only use the app to track myself.
The fact that Strava is so far behind the times is not my problem. If they want competition, enter races.
Back to etiquette, I always nod to cyclists unless I'm grinding up a hill in low assistance, and usually exchange time of day pleasantries with walkers on paths. I employ the Idaho stop when it makes sense, but always obey red lights, etc. One thing that bugs me is that when bike paths run into crosswalks, I don't dismount unless it has a sign that says so, and I had to explain the facts about bike lanes to a driver the other day. He was all pissed that we didn't dismount and walk across 4 lanes and median, and was very vocal. I stopped and yelled back if he would prefer to wait for 30 seconds while I limp across, or 5 seconds if I ride. He shut up, rolled up his window, and briskly drove off.
A few other things on city joint use paths. Slow down, especially around dogs and children. Use your voice when appropriate and say thanks for people who pay attention. If you're the first of three bikes, say two more coming! If there's a lot of cyclists, signal your intentions at intersections. Bells don't hurt, but humans are like cattle, when they turn to look they often veer in that direction. "On your left" is pretty self-explanatory!
On trails, especially single track, or other narrow paths, yield to the bike coming uphill if you can. So look farther down the track and not just right in front of you (when safe of course).
Have fun, and make it a safe and enjoyable experience for everybody if you can. Except of course for that scowling Tour de France wannabe that I passed on the hill today.