It's a form of gaslighting. They are manipulating each of your realities in unethical ways.
"Gaslighting is a form of manipulation that seeks to sow seeds of doubt in a targeted individual or in members of a targeted group, hoping to make them question their own memory, perception, and sanity."
"Fear of missing out is a pervasive apprehension that others might be having rewarding experiences from which one is absent"
-wiki
I wrote other thoughts here:
This is the third time you’ve used the term in this subthread. It appeared in your original comment and now twice more. I am reminded of when a media outlet deliberately associates a politician with a given phrase. It looks like an attempt at marketing.
It doesn't necessarily result in one questioning their own sanity, but it's definitely an attempt to manipulate the realities of the users by showing them different information that result in certain behaviors. One person is shown one thing that makes them behave a certain way. The other person is shown the results of the behaviors, assuming a different cause of the behaviors, which is not exactly the reality.
None of those people I was shown will miss me. They have no idea that their likenesses are being used to try to manipulate me. Very few people know that it is happening at all, because each person sees a different thing.
I think of it as "perception fencing", where barriers and openings are created to manipulate the information you consume and the behaviors that result, but I'm not sure that people would know exactly what I'm referring to if I use that term. If you have a better term, feel free to suggest it.