[Piskvorrr]

Statistically speaking, it is now very probable that the GCHQ has collected a huge collection of materials classified as "pornography" (as in, naked people showing themselves on webcams to each other, believing that this is a private session; apparently this is a thing). Again, statistically speaking, a significant percentage of this is likely to be classified as "child pornography" (as in, teenagers doing the above). Therefore, does it follow that GCHQ thinks of the children, and not in a good way?

[MisterWebz]

NSA/GCHQ's tactic of discrediting someone by exposing his porn browsing habits can now be used against the NSA/GCHQ.

[Piskvorrr]

Riiiight: "Oh don't worry, it's not as if the data was collected with such intent, so it's all right, no problem exists. Also, this data doesn't even exist, so there."

[atmosx]

It's just data that can be used for blackmailing, trashing, etc.