What 3rd party "pages" allow you to add optin boxes? - make your own skin care products kit

A simple question is that 3rd party sites that allow you to have your own pages (squidoo, twitter, facebook, etc) are able to accommodate an optin box?
Is it possible?
Thanks, it's just that my squidoo page has a lot of traffic but they don't click on my site so I guess if I can have my optin box in front of them!
I might go somewhere else.