For better or worse there is a growing danger in FB regarding the tons of personal data that the same users would just never give away if it weren't for FB. He is just trying to make users aware of that. He's certainly not the first to do it and hopefully not the last. Also he said nothing that could be interpreted as innovation stopper.
Out and over.
Anyway - he is Stallman and he's known for not being extra diplomatic or even smart at politics. Like you, he speaks the way he feels - point is that IMHO there is a growing problem with all the data that we - FB users - carelessly upload.
(Moreover I'm not convinced that FB has all that much to do with innovation any more but that's an entirely different conversation.)
PS: Sorry if I sounded hostile but the unabomber reference drove me mad. My bad.
PS2: this was supposed to be an answer to a comment that's not there any more - anyway.
What "tons" of personal data? I doubt I could myself collect tons or personal data about myself, not to mention data that would be dangerous.
I bet that you're quite computer literal yourself (hard to suppose otherwise since we're talking through HN) so as to be quite cautious as to how much of yourself you'll expose on the net. Unfortunately most people aren't plus they are quite good at documenting their lives (photos,videos,writings, etc) and linking in with people they know and share data and the like.
That's "tons of personal data" - it's not an absolutist firework but it's the main reason that gives FB such a high market value. AFAIK FB is considered a gold-mine in terms of highly targeted advertising and marketing that's because it hosts "tons of personal data" of high granularity and of high relevance to the real identities of the people uploading it. Otherwise wordpress for example would be considered of at least equal value with FB.