blocking websites with terminal

so i need to block the Family Feud application on facebook, because my mom insists on using my macbook to check her facebook and such and she's always playing Family Feud for like, hours at a time. I've blocked websites before using terminal, but it isn't working for this. i don't want to block facebook, just Family Feud. the link is Family Feud on Facebook

any help would be appreciated, thanks.