Any stats by F A A N G? I'm guessing for me given I have a bunch of Apple stuff that one A is getting a lot of pings. The other A very few. I have a kindle but it's not plugged in and I haven't turned it on for months. G, well I use Chrome and many Google apps on iPhone. F, have FB and Messenger apps on iPhone but assume those are mostly isolated.
Unfortunately, it's not so clear-cut by looking at which domains are getting hits, but it would make a good weekend project. I'd have to map all subsidiaries back to their parents eg YouTube or IG, and then there's the trick of dealing with third-parties, like branch.io, who appears to be very popular.