Facebook is a hugely popular social site right now. It is a place where people setup profiles about themselves, and a fantastic opportunity for networking.
This can be a great way to build relationships with others in your niche. I would suggest setting up a profile that is based on your niche, and becoming social with those interested in your niche.
Facebook has a ton of free tools that make communicating and setting up a nice page a breeze.
Please review the video to learn more about Facebook.