Social Invitation Script

I want to have the members of my website to be able to invite all of their social friends from facebook, linkedin, twitter, google+, pinterest, via email, and through other popular sites. This should be done in a very convenient way as most popular sites do that. We can start with Facebook first. I want an FB-logged-in user to immediately see all of their friends and after adding their FB credentials, be able to invite them all at once: automatically check them all and with a click of a button send them the invitation to my website. Please find their relevant API and write a script or find an existing 3rd-party solution for this. Show it on your website, if approved, add it to my website, then test and see if it works well. Report as done. Maybe something like this can be used: [login to view URL] Same thing is needed for Twitter, Linkedin, Google+, Pinterest, Email, and maybe others. It would be perfect if you have already done something like that and will save me time and money by just showing it to me and then if it's what I need, implementing it on my website. Please no abstract/generic self-claiming bids, just send me an example of what you did that is close to what I need (social invitation system), or convince me that you can easily build it from scratch (it would be easier if you actually do and then show something with your bid). Impress me! Thanks.