Do users who "send to a friend" mostly email themselves?

I'm working on a site where you can email some customized site results. Our team has a theory that most of the time people who are using "email to a friend"-style functionality are actually emailing to themselves, however I can't find any data/studies to back that up. This would affect how we design our email form. I'm wondering if there is any research or proof out there that people primarily email pages to themselves?