Phoning, texting and e-mailing are all absolutely OK for me with trusted friends. However even while having a lot of positive contact through these media, I'm phobic of them because there are people in my life who present quite a challenge for me and offer quite a test of mettle. Because these people could call/text/e-mail at any time, I can be overwhelmed. As such, when I check my e-mail my stomach feels tied up in knots. Once checked and depending on what's come in, either my head goes all fuzzy and heavy and I might get a headache, or I get a fast heartbeat and I pant. That's how bad my phobia of communication media is, and indicates how much I struggle to cope with certain interactions, which I have to negotiate but not because it was something I could choose.
So far I was talking about personal interactions and personal business, but using the phone and e-mail at work is generally OK for me.
I had Facebook, but deactivated it. Just being on Facebook made me feel exposed. I'm phobic of social networking.
Edit: I thought about forums as well. Despite being quite a regular poster here, forums are also a highly challenging medium of communication for me, simply because I'm really too sensitive for them as they really do call for a thick skin. Due to this it's a miracle I'm a regular poster on a forum at all.