ok - i don't have any specific source in mind; it could be that i am just making assumptions there. i will pay more attention and see if i notice anything.
[oh, this was in response to a reply, now deleted, saying that they had only seen "telephony metadata" mentioned - if you're the original author and you realised that telecomms metadata has been mentioned, email me at andrew@acooke.org and i'll delete this, but otherwise i'll leave it as it seems like a reasonable point.]
[oh, this was in response to a reply, now deleted, saying that they had only seen "telephony metadata" mentioned - if you're the original author and you realised that telecomms metadata has been mentioned, email me at andrew@acooke.org and i'll delete this, but otherwise i'll leave it as it seems like a reasonable point.]
[related https://news.ycombinator.com/item?id=5871665]