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These are hostnames.

There's surely not a web server hosting a (web-)site on each of these hosts.

It seems like the purpose of such a list is a block list, for people who don't want any data being sent to Meta, whether via http or otherwise.

I suppose you'd use this by blocking these domains on your firewall, DNS, or in /etc/hosts (resolving them to 0.0.0.0 or some foo).

And just like most of the blocklists, this list is made by somebody who does not know what they are doing.