It seems to me that when only one function is selected for an icon, then by default there should be no tooltip and the button should take one straight there. This is actually the case for the Whatsapp icon. When both a Whatsapp and a Facebook icon are being offered to the user, and the Whatsapp one goes directly to Whatsapp, then this makes the tooltip on the Facebook icon quite inconsistent and non-intuitive, as evidenced by my own experience.
