Currently now, posting rides is difficult because they are in so many places along with time zone problems. My husband and I have done 2 other biking sites with races from all over the world along with the racing my husband does online with rowing. All these sites have one main place to post their rides and sign up for them along with coming up with 1 main time zone. Please consider having people post rides on your Zwift site. When people log in, the rides are only posted in the time zone that current person is in. Therefore, all the rides posted are automatically being displayed in that persons time frame. All those site do this, so I know it can be done. When people post there rides have them pick different option like, jerseys, start time, average speed, how many laps, special instructions, etc. I know everyone is possessed on watts and power per weight ratio, but that is pretty individual to everyone. Average speed is not.
Thanks for reading my post.