Getting Started with Social Plugins

Hopefully this fits into the Misc. category.

In order to utilize social networking plugins, (e.g. Facebook), generally ‘apps’ need created, Page and Admin ‘IDs’ are required and so on.

When developing a site for someone other than yourself, what is the best practice for accomplishing the above? Do you sign into FB as that person to create and gather the necessary assets, or is there another way?

Sorry for the basic nature of these questions, but I have not found this searching elsewhere; And there must by many users here who fall into this category and have crossed this bridge, perhaps many times.

Thanks.