Facebook, for instance, allows you to register approval for a posted message in a very concrete way, by clicking a thumbs-up like button. Toggling off the button results in unliking your previously liked item. Note that this is different from disliking something, since unliking simply returns you to a neutral state.

[H]e […] by his overcarefulneſſe and cauſeleſſe ſuſpicion, deprived himſelf of this benefit, and implunged himſelf in much juſt hatred for his unjuſt dealing and treachery.

This twentie yeeres haue I bene with thee: thy ewes and thy ſhee goates haue not caſt their yong, and the rammes of thy flocke haue I not eaten.

And which in ravage the more loathsome evil is— / Their real lues, or our pseudo-syphilis?