It is not exclusive for Linkidin or FB; user data is targeting everywhere.I think you mean data is the new oil! But most of it's just advertising tracking
I actually find LinkedIn hilarious, started out like Facebook as a innocent social network platform but has become the biggest social engineering attack surface out there.
Everyone said and says 'create a LinkedIn' it's professional network for students and pro's, nah I'll be right.
It's more precious than oil if planning for political assassination.