At least everyone involved will fee like they did something.
This is not doing anything, but damn if you don't feel like it.
That seems EXACTLY like changing your avatar and spamming Facebook. How does spamming Facebook or changing your avatar show the effects of the NSA's spying?
That is how it is useless. It does nothing.
And this doesn't change that.
> helps more people to start understanding and caring
And this does nothing of the sort.
That's why it's useless. It is the very definition of slacktivism.