Discourse Communities

When I think about discourse communities I often think about an online forum. I am often on forums online to ask or give information to other people who are interested in Guitar advice, products and techniques. These are discourse communities because they use jargon that only musicians understand for the most part and jargon only guitar players use. By this I mean if somebody accidentally ran across the website they may not know what was being said or misconstrue what was said. Also, it is a discourse community within the discourse community of online users. Many people who post things on line especially in instant messages or forums use abbreviations that not everyone would understand.