Interesting idea, but I'm not sure what your revenue model is...?

You might want to consider changing the wording on the site. It makes it seem like your landing pages will remove facebook/linkedin/twitter from the search engine results ("instead they will see your ProfilePin page").

Finally, I would SEO the hell out the John Q Sample page (or pick an easier name that you can SEO). I search John Q Sample and your page is no where to be found. Does not speak well to your credibility.