Phyllis -

Don't focus on getting "responses" from Tweets. Twitter is like a press release engine. It gets your message out to millions of readers. They don't have to follow you to get their message. All they have to do is search to find it.

Many people get all messages based on key words. So every message I send out with #lowcarb is seen by them whether they follow me or not. And they then read my articles. But most would never reply or respond.

Lisa is right, I don't get responses often, but sometimes I do try to engage folloers by replying to a recent tweet. I've met some interesting people that way.

Engagement and interesting stuffs are the keys of success in twitter and all other social media.