My comment wasn't directed at you in the sense that you should know, rather I was pointing out that writing call options is not for someone looking for a way to

My comment wasn't directed at you in the sense that you should know, rather I was pointing out that writing call options is not for someone looking for a way to short Facebook who is not a sophisticated investor since writing a call option has a theoretical unlimited risk. Any regular stock broker could help you set up an account and advise you on how to “bet against” companies being actively traded as long as you are allowed to in your specific country. GS and other investment banks are required for much more complext trades than betting against companies. Usually trades involving illiquid markets.