I've been thinking about this for a little while now and I think Fedditor is the best choice.
Between Kbin and Lemmy, there's already two choices of software platforms for Reddit-esque link aggregators that work together. In the future there may be more. I think the term should be inclusive.
Fedditor is play on redditor, a widely used term for users of the privately owned Reddit. A fedditor is a user of a Fediverse alternative.
Since ActivityPub is an underlying protocol that interfaces with the rest of the Fediverse, I think emphasizing the Fediverse aspect and the "reddit-esque" aspect is more important than the specific software platform.
People may use different terms for Kbin vs Lemmy vs future alternatives (or ones I just don't know about), but they may also use different terms for the instance they use or for the magazine/group that they are a part of. I think if any term becomes widespread, it should be an inclusive term that fall underneath a more general term such as Fedditor.
Fedditors is probably best because activitypubbers doesnt roll off the tongue the same way. kbin is just a provider. its likr calling emailers gmailers or outlookers
I didn't like the term "Redditor" and I don't wanna be called anything based on what website I go to.
For one thing, being called a "Redditor" was typically a negative. It was a dismissive. The "hive mind" and all that. I don't wanna be associated with a "community vibe." I just want to visit an aggregator that doesn't have corporate baggage and an agenda.
My thing is, we're all just people. Using a web service. So that's what I call us. People. On the internet. I don't need or want some tribal moniker. Not here. Not across a decentralized system.