Prospecting for Buyers and Sellers by Social Networking

I've been getting into social networking, mainly Facebook. I'm seeing it take on a life of its own. First, I started out be connecting with friends and family. Then, past real estate clients. Next thing I know, one of past real estate clients from Great Britain contacting me on Facebook and said they wanted to buy a condo in Scio Village Ann Arbor because the prices were so low, it made sence to buy one instead of renting a storage unit for thier furniture. Plus, they have a place to stay when they come to Ann Arbor. It occurred to me that social networking is just another way stay in touch with the people you meet. More importantly, it give all the people you meet an insight to your personality and really helps develop your relationship with them. That's what the real estate business is really all about... building relationships. Looking for comments and advice.