Any admin from any instance can as long as both instances are federated with each other.
Say I upvote something on lemmy.ml, then the admins of every instance federated with lemmy.ml can see it in their logs.
Doesn't seem bad? It can be if someone collects this data en masse to feed some ad-algorithm with it. Or much worse, an adversary gets this data to target people based on their opinions, to dox them, etcetera.
That's the last, worst step... Installing any Meta app on your device, making it a de facto telescreen.
It's public data to some degree.
It's a whole other thing when they can see what an admin of an instance can see.
Yep. My only concern about Meta joining the Fediverse through ActivityPub is privacy related.
Any federated instance can read any other federated instance, their users and what they do or what they talk about. A perfect victim for Meta's ad-targeting data siphon.
Still using heavily encrypted, self-hosted XMPP to talk to my family without META.
Even if they somehow manage to drag the majority of users over to their platform, we'll still have our little free haven.
Get out of my mind!
Meh... just another reason added to a looong list about why I never looked back after switching to Linux, back when Vista was introduced.
Funny. They can try. I'm not as dependant on their platform as they wish-think. I'll find other ways or other platforms.