I don’t think linkedin has much value in terms of new affiliate acquisition, but in terms of managing business relationships and broadening networks within and outside the industry, there is significant worth.
It’s not at all surprising that FB takes that stance… especially considering their recent “upgrades” which were quite obviously geared toward creating more space for targeted PPC marketing campaigns. If you’re using it to market, they want a piece 
. You’ve gotta love “free” utilities.