Media and Character!

It's strange how different media change the way we express ourselves; and therefore the impressions others get of us. If you have been only conversing via email, for example, with a remote colleague, you may find him or her witty, articulate,humorous. The same person in person may be quiet and dull. Humour may metamorphose into sarcasm.
My batchmates interact on an egroup. While some remain constant to the qualities I knew in them, some startle me constantly! The person who was, and still is when we talk, dry and opinionated, on the egroup is well read, modest, logical, funny, and a prolific in his emails. Another quiet soul has an email sense of humour you wouldnt believe. Another person very dear to me is, at a party or with friends, a raconteur par excellence with the enviable facility of the right quip at the right time, making one roll with laughter. His email communications are a tad awkward and brief.
I meander when I talk. Not when I write.
How is this?