Can Souls communicate with each other?
Subjective to a person's point of view. There are many who think the soul lives on after death and goes somewhere or turns into something. There are others that believe the soul is the person themselves and simply ceases to exist after death.
Even Christian denominations are divided on what the bible actually teaches on the soul. Either way, most denominations believe that there is life after death in some form. Some believe the soul is immortal while some believe the bible says the soul dies, but God will resurrect the dead at some point in time, either to heaven or earth.