People are still think social media is social. They think that when they post something, all their friends will see it.
In reality what each person sees is determined by the feed algorithm. They can use all the things they know about you and present you content that will press your buttons and change your opinion about topics.
The biggest issue though is to have a proper content. This is where generative AI comes in and this is why owners of social media are so much invested in it.
They basically have platform like the old MSM, except all content is specifically tuned to every person.
The "likes by dead people" story broke in 2012. Ever since, I've been assuming that most likes for the stuff I've been posting, especially from friends I've not talked to in many years, are inorganic and inauthentic. Still I post sometimes because I know a few people actually do care about what I'm up to and we don't meet very often at all. Of course, I strip all EXIF data from my photos first.