If you would be so kind as to donate a piece of knowledge to the library, please post the community's name and, if possible, a brief description. If you would like the official description to make note of anything in particular, or even donate the entire description, I will do my best to suit all requests.
I currently plan on compiling the first draft of the list this coming weekend, and beginning with this coming month, I will be running a "Community of the Month" section, which will select an Avatar: the Last Airbender based community and give a well-rounded description of what can be found there, including official content, discussions, and even the people themselves, if possible.
If anybody has any questions, feel free to ask them, here, as well, until I better organize.
P.S.: The three communities I listed will be included, unless I recieve a request to remove the link, but you are still more than welcome to post for them, if you would like to make a note to be added to the description.