If you USE ALL CAPS in your email or message board posts, you will immediately make yourself seem inexperienced or ignorant. Most experienced computer users consider the use of all capital letters to be the Internet equivalent of shouting.
For those of us who spend a lot of time hanging out in cyberspace, messages written in all capital letters are reminiscent of trying to hold a conversation in which one person is shouting every word while others are speaking at a normal volume.
No All Caps: It is proper netiquette to refrain from using all capital letters in internet correspondence. All capital letters denote shouting in internet communication. Shouting at other users is not acceptable.
Why do CAPITAL LETTERS so annoy us?
rule #4 Use mixed case, UPPER CASE LOOKS AS IF YOU’RE SHOUTING
Here I found some more useful unwritten rules for moving on the Internet :
Although not an exhaustive list, here’s eleven rules you should be aware of when it comes to communicating on the web:
1: Check your spelling and grammar
2: Use proper punctuation, as though you were typing a letter
3: Avoid shortened words, it’s not a text message you’re sending
4: Use mixed case, UPPER CASE LOOKS AS IF YOU’RE SHOUTING
5: Never publish anything you would not write on a postcard
6: Use smileys to indicate tone of voice, but use them sparingly. Don’t assume that the inclusion of a smiley will make the recipient happy with what you say or wipe out an otherwise insulting comment
7: When commenting on blogs and forums or replying to an email, wait overnight to send emotional responses
8: Don’t send mail or post comments solely to point out other people’s errors in typing or spelling
9: Remember that whoever reads your content is a human being whose culture, language, and humour have different points of reference from your own. Be especially careful with sarcasm, slang and local acronyms
10: Consider that a large audience will read your words. That may include your present or your next boss, so take care in what you write. Remember too, that websites and mailing lists are frequently archived and that your words may be stored for a very long time in a place to which many people have access. Google never forgets
11: Be professional and careful what you say about others