You can check it out yourself here - http://www.brasstackthinking.com/2011/05/your-secret-weapon-for-standout-social-media-success/
One of the main points this article makes is that responsiveness is key. I couldn't agree more. It is so important to one simply respond back to people and two to do so in a timely manner. I can't tell you the number of people that simply don't respond. I can tell you that you will get further by simply responding even if it is to say you don't have the answer now but will shortly. Sometimes it is the small things that can make all the difference.
The article even suggest some general guidelines of how quickly you should respond according to the various forms of social media. What do you think of their suggested timelines for responding? Do you agree or disagree?