My experience tells me that old-time bloggers (of which I consider myself one) care more about the interaction and engagement than most. Most modern social media is just a giant show of people trying to collect accolades for how cute the latest picture of their dog or kid is. They don't really want to talk about anything, they just want to collect their 45 "thumbs up," thank you, come again.
I'm totally open to the possibility that I am boring as hell, and I have never really aspired to be An Interesting Person of Note. I write things in blog format and enjoy any subsequent engagement because it seems to offer a more selective audience... talking to my neighbor about most of the stuff that interests me would most likely cause their eyes to glaze over; here I can post something, and there's a chance that someone who finds it at least slightly interesting will interact with it.
I suppose my "ego-reason" for blogging is that I harbor a vague hope that I might be able to shake a few people out of their automaton-like trances to just pause and think for a moment. I don't pretend that I have anything grand to teach, just the vain hope that maybe I can provide a temporary "interrupt" now and then... if someone comes away thinking "Wow, I hadn't thought about it, THAT way..." then maybe I succeeded at something, in my own small way.
RE: Sometimes My Train of Thought Leaves the Station Before I Can Get on...