I've just given my son my old 2008 MBP, which has Yosemite installed. I set up parental controls with the 'try to limit access to adult websites' option ticked, but it seems less than useless. I set up a test account and typed in any dodgy url and you go straight there. Having had a look around, something like Web Watcher software seems to be the only answer, but that monitors everything he does and I don't want to snoop on him. I just want to protect him. Has anyone found something that will allow a decent level of control.....and why is the default protection so poor I wonder?