LinkedIn business model, an example for Facebook?

Big difference between LinkedIn and Facebook is not focus on BtoB or BtoC but their business models.

Facebook focuses on ads and, my take, makes the wrong choice.
They bother their users with irrelevant ads they cannot opt-out and are loosing their cool image.

LinkedIn focuses on services and, my take, make the right choice.
They serve their users the best they can and do not prompt them with irrelevant offers they cannot opt-out.

Good news is that it's not too late. Premium subscription withouts ads, bigger storage,etc., premium services for brands (that are not ads), can be easily deployed by Facebook.