Is the online group you are regularly participating in a community?

The online group I regularly participate in, the Ultimate Guitar discussion forum, is a community. Ultimate Guitar is a website that features sheet music for electric, acoustic, and bass guitar and also has reviews for guitars, amplifiers, and guitar oriented music. Part of the Ultimate Guitar website is their forum which features discussion of different genres of music, instruments, and a chat room known as “The Pit”. Most of the conversations that happen on Ultimate Guitar come from The Pit because it is open ended discussion forum with no specific subject other than what the users deem to post.
While all people visiting the site share a common interest, playing guitar, many do not contribute in ways that are associated with or that relate to topics about the guitar. In fact, as mentioned earlier, most discussion that happens on the forums are related to things such as politics, sex, and current events. Going back to the discussion over whether this is a community or not, the site has regular users and moderators who monitor and censor them. This is one way in which the website is like a community. The moderators, or leaders, are tasked with keeping the forum a safe place and can also serve as a way to keep the discussions flowing by locking out and keeping the same topic from being posted many times over.
The reason why this online group should be considered a community is that while its original focus was on music and guitar education, which it still tailors to in a lessened format, it has really evolved on its own into a place where free discussion is welcome. Everyone who uses the forums is contributing to at least a few of the conversations. Some may contribute more than others and will be eventually granted the title of moderator and some users may become inactive after a certain amount of time. This is similar to real life in which some people do more and are rewarded and where some people just faze out and die.