They added a indicator "You’re All Caught Up" when you've seen all new posts on the feed. Of course there can be some posts below the indicator that you haven't seen.
Now also Strava is making their feed sorted by some magic with no option to make it chronological :(
I can't quite understand this trend.
It's a symptom of the way our industry works. Pick a metric and over optimise it.
Say you pick the "time to like a post" metric, then as an employee you're incentivised to put the most click-baitee article at the top.
Now if you pick the "number of ads displayed in feed without drop-out" you may have something similar too.
Rince and repeat and you end up with the mess we see.
Regarding Instagram, I noticed they started to retain posts from the timeline. So they encourage compulsive checking it the app.
Open it once : it shows 2 new posts, close it and open it again, 2 more posts, both old by at least a few hours.
They just rewarded your brain for checking the app compulsively. Once I noticed that I couldn't unsee it, and I closed my account.
I _think_ strava is just when a user actually posted to srava, it used to be when they did the ride, but you would miss friend's rides if they only update strava the next day. I slightly preferred the old way, but it isn't too bad so far.
I asked them about it and they told me the feed is sorted based on what they think is most interesting. They have a survey about it at https://www.surveymonkey.com/r/NewStravaFeed
Long gone was the interesting content in my feed, I only had indoctrinated contacts posting either poor quality content or misinformation.
I think facebook lost me when they stopped the chronological feed, which is also why I closed my Instagram account.