Being some kind of genius, of course I knew about “two-hop surveillance” way back when, but I’m posting this for those who don’t. I’m generous that way.

How FBI (or Congress) Can Use Warrant Surveilling One American … To Spy on Many More
sharylattkisson.com | December 17, 2019
Believe it or not, intelligence agencies can use one legal wiretap to monitor as many as 25,000 people for which there was no wiretap justification.

…

Through a single warrant, government agents can capture phone calls, texts, emails and bank records from people “two hops” away. That means all of the suspected spy’s direct contacts — “one hop” — and everybody who contacts those people or even visits their Facebook pages or websites — two hops.

In this way, one analysis found intel agencies can use one legal wiretap to access 25,000 people’s phones.