It can be easy to misunderstand or be misunderstood. Take the time to read carefully and ask for clarifications if you are unsure of your perceptions of a post. Above all, assume good intent. It is a handy approach. Start collecting tools - One technique used online is the use of emoticons and abbreviations.
Emoticons are keyboard symbols constructed to convey an emotion.
The host of this site, Heather Duggan, has mined many great resources. Check out her great list of links. Moderator's Homepage a great list of resources, many of which address online learning.