Hi, I think you are going to do affiliate marketing for email submits. I am doing it for years with perrfly and different companies an i have extensive research and expertise in this field.
Here i will offer you the following things
Lead Page Redirect on email submit
Social Sharing on lead page
You have the option to create affiliates on your own that work for you. Like email invite integrations and social share integration. For example, if someone lands on your site they will be presented with a lead page and an email form. On email submit a new page will be opened of your affiliate but in a new window. Your website will offer the email submitter to get anything like free books or vouchers or cards for inviting 10 members more who will signup too. Then he just need to click on share button to do facebook, twitter sharing or click on email invite. Referrals will be tracked with simple technique like each email submitter will be assigned a unique url like http://yourdomain.com/ref=122 so you can track your affiliates. Further, if he wants to see how many people he referred he comes to your site and enters his email. He will be redirected to his referral page again.
You can capture emails for Aweber, Mailchimp, Wordpress database or any program exist in the world.
These options are all optional. You can on/off them
Further, in the future you can customize your lead page yourself.
Thanks