One thing you absolutely need to build a community is to care about others, to give a damn. Think about what you can do to change things, as small as it may seem, and start doing it. At first, it may not seem like much. But in time, things will change.
We are all connected; you just have to make the first move. Create a spark, and the results can be mind blowing.
Connect, just like Juan Mann did in the Free Hugs Campaign he started over three years ago in Australia. Today, there are such campaigns all over the World. It spread like wildfire. A community was formed.
You can make a difference, one person at a time.