Did you read the article? Your comment is exactly the perspective the article is addressing. They cited acknowledged experts in the field, whereas you've cited "common sense", a subjective term that means nothing without context.
It does not address exactly what a social network would accomplish for the consumer beyond acting as a conduit for advertising. That's where the issue is.
Every website is a social network in its press release. Journalists will repeat those descriptions. Don't fight it, you'll lose your mind.