I don't see any value to Twittter, and I try to keep my Facebook presence more limited to friends and family. Though I have 'friended' some Lawnsite folks and other colleagues, I have not friended any customers on FB. To me, FB is for posting photos, tell about a concert I've attended or a vacation I took, sharing opinions or recommendations for music, food, beer, films, etc. These are not usually things I share with clients, especially anything to do with politics or religion or otherwise controversial... I also don't want to expose them to a few of my friends who might not be as careful as I am about their use of language, etc. I do connect with clients on Linked In, and some of them have written me some nice recommendations, and some of those have led to work. Unlike Yelp or Angie's List, Linked In encourages you to solicit them, AND you can edit whether or not a recommendation appears on your profile.