With any kind of product, the basic goal of it is to get users to use it. This can be seen pretty clearly with e-commerce websites: the more people use it, the more the company behind it gains from it.
But the same principle can be applied to any other kind of website or software product in general. In case of a social network, you want as many people as possible to use it, because you can collect data from users and show them advertisements, and in the end this all will convert into bigger profits for the company.
A similar point of view can be used for intranet software: the easier it is to use, the greater the productivity of the employees will be. And this means more production and efficiency, and in the end again higher profit.
