technically it's not part of any definition of "social media", but it's so ubiquitous that pretty much every well-known social media platform has it. this thing is a recommendation algorithm that acts on its own filters and aggregates items onto a homepage; usenet only had "filtering" by rooms. and yes, this definition would include reddit with its algorithm. i'm still unfortunately unable to find what you're referring to that would be such an algorithm.

though since the beginning this has been a bit of a tangent—i mentioned disregarding that part of facebook's innovations since it would be an unfair comparison. what did you mean when you said i was, well to put it a much harsher way than what you actually said but in the only way i can succintly summarize it after putting down this overly long disclaimer, dismissive of innovations?