I don't know where this will end up in, but I know I can:
sudo echo "127.0.0.1 reddit.com # The real blackout" >> /etc/hosts
sudo echo "127.0.0.1 reddit.com # The real blackout" >> /etc/hosts
perhaps: echo "127.0.0.1 reddit.com # The real blackout" | sudo tee -a /etc/hosts ?
# Block Reddit Experiment
||redd.it^
||redditblog.com^
||reddit.com^
||redditinc.com^
||redditmail.com^
||redditmedia.com^
||redditstatic.com^
||redditstatus.com^
I've been using that as an experiment to see how many times I click a link that is blocked. Thus far only once.