What Makes a Community - Can Technology Provide What it Takes?

To me, there are only a few things that are essential for a community. The first is people. There needs to be a group of some intelligent (or at least somewhat intelligent) beings for a community to form around. For our purposes, human beings will be those living beings. The next is communication. There needs to be some way for those beings to understand that there are other beings that exist. The communication doesn't even necessarily have to be complex. The last thing is some kind of reliability between the living beings. I believe there has to be some common ground. This can be a similar interest, a cultural connection, or anything along those lines. With all of these things together, we're able to have a community. Say there's a group of people living in a neighborhood. They can be a community since they are a group of human beings, able to speak to each other, and their common ground is the fact that they live in the same area. Now, take a group of people who, for example, all see online that there is a concert going on in their area. They can all meet up regularly at the concerts and their common ground could be that they all enjoy the same artist playing at the concerts. In this situation, did technology create the community, or did it simply help the creation process? What if there's a group of people who log on to a video game's forum site. Many people post topics and talk with each other daily. Here, we again have a group of human beings communicating with the common ground being they all play or are interested in the same video game, except this community exists purely online. I think this is a great example of how technology can provide what it takes to create a community, and as you can see, its not much different than a community outside of technology.