  We discuss the concepts of mutual and tripartite information by referring to
simple intuitive examples, and describe their use as probes of thermalization
in holographic models. We then review our computation of these quantities in a
simple time dependent model, in which energy injection in a strongly coupled
field theory is modeled by a shell of null dust falling into 3d anti-de Sitter
space. We complete those results with a discussion of the possible equilibrium
phases of the tripartite information.
