>>2994453 lb
What I mean is, let's say someone visits my public FB posts. Is that a valid vector?
How else could you detect and intercept dead drops?
How do you know if they are being contacted by me unless you place them under surveillance as well?
There is a lot of open room for who is or is not a vector beyond simple phone calls, handshakes, and private messages.
But here is the challenge with things like message boards or public posts. Let's say I post to someone on my FB page. They post to me on their twitter using a code name or simple inference. No direct communication is shared.
If the intelligence community is to do their job; then they must be able to, if I am posting to people using a public system, make the jump to people who frequent my public pages or people I frequent the pages of.
But then this gives them a hell of a lot of power to justify increasing the size of that net.
It's something of a constitutional crisis, I would argue.