I have been on Facebook for quite some time. My friends range from family, actual friends (some that I've grown up with), clients and other real estate related people. I don't post a lot but I've discovered a new item that will automatically send my Twitter Tweets to Facebook and my LinkedIn account called Hootlet which makes it much easier.
You can search for homes on my community Facebook pages. I also invite local vendors to introduce themselves and Like and post on my Facebook pages and I'll "Like" their pages in return. Local vendors should band together and support each other.
I just started a Twitter account and I still don't understand what all the interest is. I can't keep up with all the tweets and prefer the Facebook experience much better. But if you'd like to follow me go to my Twitter button on the top right corner of this page (the icon with the bird).