  The speed at which the magnetic interaction propagates along a chain of
classic dipoles is discussed here. While in the quantum information counterpart
for long-range interacting spins, where the speed of propagation of the
information plays a paramount role, it is not strictly clear whether a light
cone exists or not, here we provide numerical evidence that interacting dipoles
do posses a linear light cone shortly after a perturbation takes place.
Specifically, a power-law expansion occurs which is followed by a linear
propagation of the associated interaction. As opposed to the quantum case, and
in analogy with the so-called speed of gravity problem, we find that the speed
of propagation of information can be arbitrarily large in the classic context.
In order to agree with special relativity, we propose the derivation of a
frame-independent Landau-Lifshitz equation.
