On my 1999.io posts, I didn't realise there would be any comments!  I only stumbled upon them by chance, as a result of going back to an individual post and re-reading it. How would I find out someone had posted a comment? The solution, if there is one, is to have a river of comments, I think. Maybe everything should be a river. Like Twitter, like my email inbox, like the TV and radio have always been (just one damned thing after another), certainly like Dave Winer's rivers. His Guardian river uncovers what's really happening with news articles, whereas the main website pretends its all static, like a printed newspaper front page. But it's all very far from static.  

πάντα χωρεῖ καὶ οὐδὲν μένει
Everything changes; nothing stays still.
- Heraclitus (quoted by Plato in Cratylus, 402a)

I find Facebook overwhelming. Too many 'friends' to reply to. The result is I just look at it twice a year, in case someone posted something earth-shattering. They didn't.