I saw some people using a nice technique to fill your email list with your traffic coming from Youtube.
There is a link in the description to access a content, and once you click the link, you arrive on an opt-in form.
Once you give your email, you are redirected on the page with the content.
The beauty of this is that if you already gave your email, you can directly access the content page. You don't need to give your email each time you click this link.
I think it has to do with cookies and redirection. Once you give your email, a cookie might be installed on your computer. This way the next time you don't see the optin form.
Does anyone know exactly how to do this ?
Thank you !