As far as I understand the Actor Model and the Reactive Programming are separate concepts. Actor Model does not seem to be inherently reactive to me.
However the Akka framework which is an Actor Model implementation is being described as reactive:
Is it a case of misusing the term or they are completely correct? Is any actor model implementation (e.g. Erlang) already reactive? Is simply generating messages as a response to other messages considered reactive as well?
Some related reading where the approaches are contrasted:
StackOverflow: RX vs messaging queues like rabbitmq or zeromq?
Lambda the Ultimate: Actors vs. Reactive Objects