Yes, there is /etc/hosts and also /etc/hosts.editable , but no hosts.allow and no hosts.deny as I once upon a time saw in some desktop linux distros.
How can I use these files to block some adresses (e.g. G**gle or fb)?
Highly interesting would be to hold back and supress all the outgoing requests to these (or some other) adresses that are coded in nearly all webpages, and not only block incoming data packages from them (G*, fb & similars)!