[intergalplan]

The collection is per se harmful as long as warrants exist.

Beyond that, it's an open secret (as in: it's been mentioned several times in available documents, but never deliberately disclosed or extensively discussed publicly, so far as I know) that since at least the mid or late 00s the US government has had contracts with multiple major tech companies that have a high level of access to citizen Internet traffic to basically search their databases of Internet activity at will. Which companies these are, I'm not sure—I suspect it's mostly telcos, personally—but it's another reason the existence of these datasets is inherently dangerous, and that they should not be permitted to exist at all, no matter who holds them.

[cm2012]

The government doesn't go to fb when it wants someone's website history. It goes right to the ISPs.

[tnzm]

What about your chat history then? Social graph? Statistical model of your behavior?