You actually don't need to connect it to FB for now as it's only the new systems such as Quest 2 that are forced to link it to FB. However, they have threatened to change that in a year or so even for the Quest 1 and Rift.
There are two use cases for laptops. The first is the normal one where you carry your laptop around wherever you go, and actually use it on your lap sometimes. The second is to view your laptop as a mobile desktop, where you have a few stations. The laptop would always be plugged in, but it might be plugged in different places.