Noticed something on two rides with Strava this week:
https://www.strava.com/activities/664789946
https://www.strava.com/activities/662535019
For both of these rides I was relatively close to another cyclist for a portion of it, upon finishing the ride it shows my ride with them listed too. I don't follow either of them on the app. Possibly a new feature to let you expand your following/followers list?