Well, I know it is possible to read someone's aura, give a message from spirit and/or attune a person to reiki via the internet (chat rooms and emails), so manipulation of energy doesn't seem so far-fetched after that... It's a matter of intent and focus, I should imagine, just as in any energy manipulation.
I have felt energy pulses or waves when I check into some websites, so I make sure I am shielded, just in case something nasty is there.

Telephones, tv etc - again, just another form of energy connection, as are the written or spoken word. It doesn't take much research to note the manipulation which goes on via these methods of influence.

I believe chaos magicians and neo-shamans can work this way, although I have little knowledge of that area.