Communication online and in person certainly differs from each other. A variety of factors are decisive in these two separate situations. First of all when communicating in person I can use more aspects to appeal and convey emotions to my interlocutor. I can use my hands to gesticulate (I do it quite often), I can hold the other person captive with my eyes, making him/her listen to me intently and not look around absentmindedly. I can immediately read my interlocutors stance and pose so I know if I’m boring or intriguing him/her.
When writing I have more time to think about the words I want to use, about sentence construction, cohesion and coherence of my utterance. In live dialogue you have microseconds to formulate a thought and air it. It is more instinctive, maybe not as refined as writing but still the rawest and purest you the other person can receive.
As for the other question I have to say that written communication when comes to conveying emotion and intent is lacking something. In person to person communication, as I’ve written above, you can use your whole body to send the message, to reinforce it, to give it an emotional impact. When writing you have to rely on your vocabulary skills. You have to write in such a way that the intricate lines of words captivate your readers, allow them to imagine the scenes and emotions. You have to be convincing.
I try to pour my thoughts on a paper in a way that will allow my readers to feel the emotions that build up in me. To feel and understand them even though they cannot see me. If I succeed, if at least one person feels moved, inspired or interested in my writings, well then I can call it a good day. And immediately sit down to scribble another piece that will hopefully capture your attention.