Se avete necessità di bloccare Facebook sul vostro Mac può tornare utile questo piccolo applicativo.

[Link]

Tiger, grrr…
/System/Library/Frameworks/ApplicationServices.framework/Frameworks/LaunchServices.framework/Support/lsregister -kill -r -domain local -domain system -domain user

from Leopard and beyond…

/System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/LaunchServices.framework/Versions/A/Support/lsregister -kill -r -domain local -domain system -domain user

By terminal:

chflags nohidden ~/Library/