With this PrestaShop module your customers will have possibility to quickly register and log in to your shop with their Facebook account. Module adds buttons to most important places of the shop (from register user / login user / order process flow).
Addon creates everything automatically, it is enough to click on button and accept facebook permissions - right after that - customer account will be created in the shop.
more informations about this module you can find on official module website:
You can find there only valuable solutions for your e-commerce shop based on PrestaShop engine. Search the best plugin for your store that will meet your requirements and just use it.