It's entertaining albeit unfruitful to wonder who could be behind. FB's reputation has been tarnished specially in the USA (which hints that it's an interest originating in the USA).
I'm not saying all criticisms are without merit, I'm saying that's very interesting that so many 'different' outlets have begun to directly criticize Facebook.
I like stratechery's opinion that a lot of FB's problems (legitimate concerns under scrutiny) aren't really FB's but the Internet's (given that FB is a large portion of the internet, and for certain users it's really most of the internet).
tl;dr; it sure seems like a lot of FUD about facebook these days.