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For those with dependent minors and other sensitive and impressionable users on their systems, OpenDNS offer nameservers that filter out adult and inappropriate content and make such links inaccessible.
See their site for more:
https://store.opendns.com/setup/#/familyshield
To set up this service in BunsenLabs, edit the file at /etc/NetworkManager/NetworkManager.conf and add this line to the [main] section:
dns=none
Then modify /etc/resolv.conf and replace the NetworkManager-generated nameservers with the OpenDNS alternatives:
nameserver 208.67.222.123
nameserver 208.67.220.123
Reboot to effect the changes and test the service in the link given above.
In the interests of balance I should probably note that OpenDNS was recently bought out by Cisco and they are trying to sell a service.
For more complete content filtering, look at privoxy or DansGuardian
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