Facebook Viral Script

As the title says, we need a viral Facebook script. When someone visits our site, if they're currently logged in to Facebook, we should be able to automatically have them share and/or like content INVISIBLY. Needs to be able to handle large amounts of traffic, no developer/API tools or anything of that nature that get banned within 10 minutes. We should be able to set parameters for likes and shares, i.e. which post to like or which link to share. Again, likes / shares should be invisible and automatic or we're not interested. Please do not bid if you're unfamiliar with this type of work.