No, your flipbooks can have unlimited pages with Paperturn.
Yes. If you have multiple PDF files, you can overwrite a "publication slot" at any time and as often as you wish. However, this will only allow one flipbook to be published online at any one time; if you wish to have numerous flipbooks active together, you will need to purchase more "slots".
Your logo will be shown when your publication loads. If you wish your logo to be constantly displayed behind your flipbook, you may want to create a background image that incorporates your logo and upload this onto your account.
A private publication cannot be viewed by everyone or shared via social media.
There are two ways you can allow access to a private publication:
1. Define a username / password combination and share it.
2. Enable the IP addresses of those you give permission.
Detailed instructions of how to set this up can be found here.
Yes, and Paperturn also takes care of automatic backup.
No. The high efficiency of your flipbooks is ensured by the fact that the flipbooks are hosted in "the cloud". But you can of course link to your flipbooks from your website.