Strava Fly-by setting or bug?

[HarryTheDog]

On my commute I shadowed a guy going at a decent rate for a few miles then he turned off. When I got home I looked to see if he was on fly-by, he did not show up but someone further up the road did so I looked at their fly-bys and the guy just in front of me appeared on their list. Also when I looked at the guy who was just in front of me's fly-by I apeared on his list. I checked Strava setting either you allow people to see you or you dont, you cant set just your followers etc.
anyone know if this is a bug or a setting?
This is the activity https://www.strava.com/activities/696946829
the person in front I cant see on my fly-by is ian, the person further up the road was ayna.

 

[Tanis8472]

I would say its because they have follower requests set to ask permission first. I cant see ian

 

[jefmcg]

It's just a bug, or a quirk anyway. It's very much a beta project, and their algorithm on how they decide someone is nearby is interesting is probably not perfect.

 

[HarryTheDog]

@Tanis8472 I have my follower request set to ask permission as well but I think everyone can see me on fly-by so probably @jefmcg is right. I won't leave sleep over it, I just find it interesting to see how many miles the people I come across are doing.

 

[Lozz360]

I would say its because they have follower requests set to ask permission first. I cant see ian

Fly-bys are not just your followers. Normally anyone on Strava who has passed close to you on your ride shows up as a Fly-by.

 

[Deleted member 26715]

I find it quite fascinating coming back from a ride & seeing if the people you see are there, intersected with a group the other day, when I checked the flyby it was a group of 15 which split up to go their own ways later, what was interesting was 1 guy left the group early to make what I presume his way home, another didn't leave for another few miles & went a different way but ended up well in front of the 1st guy as they came back together on the same road. Strange how trivial things can be interesting

 

[Nigelnaturist]

GPS units might also show slightly different time stamps, 10-15's can make quite a difference. i know they should sync with the satellites but...........