||facebook.com^$domain=~facebook.com|~facebook.net|~fbcdn.com|~fbcdn.net ||facebook.net^$domain=~facebook.com|~facebook.net|~fbcdn.com|~fbcdn.net ||fbcdn.com^$domain=~facebook.com|~facebook.net|~fbcdn.com|~fbcdn.net ||fbcdn.net^$domain=~facebook.com|~facebook.net|~fbcdn.com|~fbcdn.net
If you need it to appear anywhere else temporarily then you use the AdBlock switch to temporarily whitelist a site or domain.