Maybe the best thing would be for people to get out and make some friends...
I second the request for this. A sortable list of all segments you have ridden, with the 'trophy' icon next to the ones you are top 10 on
It would be a nice feature, just when referencing back to rides.
Presenting it in a "timeline" format would likely be the most effective way. A scrolling area where you can go all the way back to your first ride and see achievements