Earlier quoted context omitted.
Well, the author was making a point about the way people interact with their omnipresent tweetdeck/camera device. He was painting a picture for the sake of making a point, not for the sake of "hey, I'm in Singapore".
> He was painting a picture ... Exactly. Stop there. The irony is that he did exactly what he was complaining about , but in words, not pictures. He apparently missed the part where that is externalizing his life. I'm more careful than you to eschew attributing intentionality, but the effect is the same--he externalized his life via a blog post that decried externalizing one's life. It's all about words. If he'd been…
"Write about it in more than 140 characters; on paper even. Paint a picture of it. Talk about it face to face with your friends. Talk about how it made you feel"
It doesn't seem the author is complaining about all externalization, just the externalization that takes place during experiences, like posting pictures of yourself eating a meal while eating said meal. I just don't see the irony you mention, as he is doing exactly what he said people should be doing.
As for the rest of your comment...I'm inclined to agree that the author's post is an overgeneralized complaint, perhaps even with fundamental logical flaws. However, hidden in the haphazard argument there seems to be a tinge of truth regarding over-sharers.