I don’t want to force people to join a/my/some club. I want to let my followers and friends see I plan to do a 80km ride Saturday morning and let them simply tag along. It could easily be integrated into the feed or as a separate section.

I’d argue social activity is one of the biggest opportunities for Strava to lock themselves in as the hub of all movement activity - but it requires supporting how people like to naturally organize in a local community.