I love Twitter, but I feel it's time to make a stand for the fact that many people DO NOT need to use it - at least for business purposes.
I have met so many small business owners in recent months who are stressing out about the idea of needing to be on Twitter. They don't know why they should be Twittering, but they know that everyone seems to be talking about it.
Small Business Owners, here is a message for you: unless you provide something that people can buy over the Internet or otherwise long-distance (e.g. phone consultations, a product, etc.), then the single most effective marketing effort you should undertake is picking up the phone (or writing an e-mail) and contacting current, past and potential customers. Next, plan lunch dates with other professionals and businesses that refer business to you. That's it! Don't worry about Tweeting or Blogging or Facebook-ing. Just focus on building stronger relationships with the people who already know who you and are likely to refer you, and I guarantee that your business will grow.
Give it a try, and let me know if you have any questions!