Personally, I believe the anonymity of an online chat board allows people to say (post) words they never would say (post) if they were discussing issues face to face.
Also, at times I do not believe the written words are understood in light of the meaning the person who posts them actually meant. We are missing the visual cue of facial expression, body language, etc., and the auditory cue of whether words are spoken in anger, shock, sarcasm, love, etc. What might be understood in a couple of spoken words could take several posts (or pages of posts) to get the point across or glean the meaning.
Here are some verses we could all keep in mind before we hit the submit button:
Psalm 15:1 A soft answer turneth away wrath: but grievous words stir up anger.
Ephesians 4:29-32 Let no corrupt communication proceed out of your mouth, but that which is good to the use of edifying, that it may minister grace unto the hearers. Let all bitterness, and wrath, and anger, and clamour, and evil speaking, be put away from you, with all malice: And be ye kind one to another, tenderhearted, forgiving one another, even as God for Christ's sake hath forgiven you.
Philippians 2:3 Let nothing be done through strife or vainglory; but in lowliness of mind let each esteem other better than themselves.
I think we all have something to share with others here and we could also learn from others here. God tells us in 1 Cor 12 that He has placed every member in the body as it has pleased Him and no one can say that a member of the body is unnecessary. There should be no schism in the body and we should all have the same care one for another. We are all members in particular. Such an awesome picture is drawn from theses verses if we'd ever get it through our skulls.