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Well everything that imports the Facebook SDK or allows sign in with Facebook does this so as long as an app has that blue button on the screen, you shouldn't be surprised that it will phone home to Facebook once the app is opened and initialised.

Too bad it isn't practical to have a system-wide blacklist of selected hosts on iOS. Maybe you can but requires a jailbreak, but that too can break some apps.

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There are some “VPN” apps that can stop connections system-wide. I’m not sure about custom block lists, but take a look at the free Lockdown app (it’s FOSS). It does all processing on-device. There’s also a paid app (which for me is an expensive subscription) called Guardian Firewall, which uses its servers to process requests.

If you 'supervise' your iPhone you can also configure an adblocker with a proxy auto-config. Less fiddly than a VPN but harder to customise! Supervising requires a wipe too. https://github.com/essandess/easylist-pac-privoxy

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