When communicating online we should remember we lack the facility of expressing ourselves better as we could have done through the tone of our voice, our facial expressions, body language and hand gestures along with the words we say. Hence to compensate these drawbacks we can:

• Add some wording to the pure content of our message to avoid coming across as sharp or critical.
• Occasional use of emotions like the smiley face :-) at sensitive points in our message can make
  sarcasm or humor clearer.
• We should make use of italics or a bold style on words or phrases to emphasize them; avoid using
  all capital letters to stress something -in the online world, this is equivalent to shouting at our readers
  we mean that we should have a bunch of them even one or two would do. It may be the case that we
  do have friends but due to some circumstances we get miles apart both geographically as well as mentally.
  At such a time we need to begin afresh and befriend new people or revive our old relations.
• We should discuss only one message in one topic because if topics not mentioned in the subject are discussed
  then they may be overlooked by the reader.
• The subject line should be precise but sufficiently large enough to explain its contents.
• When communicating via conferencing then it becomes difficult to distinguish who is replying as many
  messages are getting exchanged. Hence we could possibly follow the following ways:
• If possible, change the color of the text. Each team member may wish to select an
  identifying color to represent him or herself in small group communications.
• In some environments, just as in our favorite word processing package, we can
  change to a number of different fonts. This is also a useful way of distinguishing
  between "voices."
• Suppose we are replying to someone’s message, and we want to respond to a
  particular paragraph, and then quote that text in your reply. To avoid confusion,
  we should also type in a reminder of who said this above the quote, like "John
  Doe said:"

• We should think carefully before sending a message because it should in no way hurt the sentiments of the
  person on the other side. And being invisible you do not have the chance to mend your faults.