When a link is shared, it is replaced by a link to a shortener (kcy.me). All the traffic generated through this shortener is bound to the person that created the link; thus, counting kclicks (clicks that carry karma).
So you can interact from karmacracy's external services, a special key is generated. You can regenerate this key whenever you want to. You can have one after logging in, and browsing to settings > 3rd party key.
A kclick is the real value of a click with karma. A kclick is less than or equal to one click. A click made by a robot is equal to 0 kclicks. A click made by a human in perfect conditions for karma counting is equal to 1 kclick. It is the effective weight of a click.