Summing up it's not because facebook was better, it's because livejournal got worse, and secondarily forgot to become better technically.
Over time, I posted on Facebook more and more and LJ less and less. It got to the point where I'd go months and eventually years without touching LJ.
I think the last time I posted anything was in 2009. The last time I touched it at all was in 2011 or so when I had a phone interview with someone, and the interviewer said he saw my LJ and he made jokes about it. So after the call, I found a script to mark every post on my entire LiveJournal as friends-only, ran it, and threw a line in my bio saying that everything in there is years out of date, and that was that.
Without comments means it cannot be similar. LJ allows horizontal communication, Telegram channel is essentially a radio in text. No interaction except for polls initiated by channel owner.
E: like this https://tlgrm.eu/channels
I myself don't like to use Telegram like that, I prefer to separate my IM from my blogs. But your answer caused me to rethink Telegram, because now that I think about it I do know people who participate in that part of Telegram.