I believe one of the aspects the NLRB is protecting here is the right to complain and collaborate via email or other electronic means. collaboration is key here. You would not be protected in speech based on saying something like "My boss John Doe is an incompetent asshole" because there is no collaboration there... its just a statement. I could be wrong here, but as I understand it, you would need to add in something to the effect of " my boss john doe is an incompetent asshole and would anyone like to start a group or get together and talk about it?" The reason goes back to some basic things like the right to form unions with out being fired, threatened or physically stopped (this used to be very common (Pinkertons)). This is not a groundbreaking decision here... any labor lawyer could tell you that... the real headline here is that this is how it should be and soon the Congress will most assuredly do everything they can (short of blowing up the NLRB) to stomp this out of existence.
