You can join the Jellybooks mailing list without any need to register with Jellybooks. Registration is mandatory though, if you are participating in a test reading campaign and we will also ask you for your age and gender before you can download the free ebook. Some publishers would also like to know some additional details about you to better understand whom books appeal to, but such questions are totally optional.
You will need to provide this information only once. We will remember it for future visits. You can of course use the same Jellybooks log-in credentials across test reading campaigns sponsored by different authors and publishers.
You can register either via email plus password or by using Twitter, Facebook and Google. Whatever option you choose becomes your future path for signing-in. You can also choose multiple options when signing up, so that you have a choice of how to log-in in the future.
Please do not disable the "share my email" option when registering via Facebook or Twitter. That would thoroughly screw up the registration process as email is your central identity at Jellybooks no matter which registration method you choose.