If you use Gmail or better yet Google Apps as your email client, try the new add-on (for Firefox and Chrome users) call Rapportive, www.rapportive.com
When you receive an email from someone, the Rapportive add-on (extension) will go out and search tons of Social Networks and find information associated with the senders email address. The West Valley Home Team uses it and we are able to see other pertinent information about a client before making a call or responding to an email from them. Wouldn't it be nice to know a little something about what your clients interest are, what they like and don't like, BEFORE you contact them? See they are a Dallas Cowboys fan? Don't mention "did you see the game today" when you know the Cardinals beat the Cowboys 30-7... Maybe you see something you have in common with that person and can use that to make that personal connection.
From the Rapportive website: "Rapportive shows you everything about your contacts right inside your inbox. You can immediately see what people look like, where they're based, and what they do. You can establish rapport by mentioning shared interests. You can grow your network by connecting on LinkedIn, Twitter, Facebook and more. And you can record thoughts for later by leaving notes. Imagine relationship management built into your email. For free."