It's upvoted because it demonstrates why the original comment is exactly what shouldn't be on HN: an empty stream of popular jargon that turns argument into a hipper-than-thou fashion show of buzzwords and name-dropping. HN should be more than a beauty contest to see who can sound most like a guy who's going to get rich someday. keyist's comment may be ugly, but it's insightful and just.
I completely agree with you. I'm saddened by the number of up-votes, given the tone of post doesn't encourage continued discussion nor add substantively to the information in the comments.
What I think is particularly sad is that I bet he/she could have given a good argument that helped people understand the dangers of a Facebook-monopolized Internet.