If you search around there are several libraries you can join from afar without proving local residency. I had like 5 libraries from around the US on libby while the free downloading was still viable.

I’m not defending them here but those are phrases people are throwing around online as speculation.

IP addresses

MAC addresses (physical devices, bluetooth devices in range)

Wifi access points

Cell tower access points

Browser cookies

Browsing history

Search history

Email (and its contents)

GPS paths traveled

Contacts

Apps installed, apps used, frequency of use

Hours inactive

Photos, videos

Just thinking about Google here as I don’t use meta products, but my phone is android…