I haven't seen this feature mentioned but I have friends who have the same device I do. We like to check each others ride data... It would be nice to be able to comment on each others data.
Has this been suggested? It could really turn into a social meduim of athletes and their adventures.
Also, I have to search for their names and data everytime. If I could just "friend" them so I would have a list of links I could click on for each friend without having to search, that would be cool. The whole social thing is huge on the net. I'd think something like this with a nitch for cycling, running, etc... could be pretty big.