For those of you who don't know, Twitter is a cross between a blog, RSS feed, and stream of consciousness. Basically, you post very short messages about where you are, what you're doing, and what you're thinking. Your "followers" read what's going on about you, and you can read what others are up to. It's like a conference call that's always running in the background; you can hear other's comments and reply if you wish. The beauty of Twitter, what sets it apart, is the quick bursts of information that somewhat replaces emails or blog entries.
In an article on Businessweek, there is a debate on the beneficial nature of Twitter in business. On the con side, personal interactions suffer the most from this instant communication. The example given is a lunch meeting. If you are twittering about your lunch, while you are at lunch with someone, then you are basically having lunch alone. If at a business conference, why worry about updating your followers, when there are live people in front of you with which to interact with.
The pro arguments seem to embrace the intended nature of Twitter. It is highly useful as an information source. For example, if you twitter that you are looking for a better chair, anyone following you can instantly reply with good suggestions. These suggestions would probably never come up in normal conversation. At the business convention, a Twitter search allows you to see which other Twitters are there, facilitating networking. For a company, Twitter is another way to connect with customers and potential customers, much like what is done through a blog. For example, check out the AccuConference Twitter!
Both sides have great arguments, but the answer lies in not black or white, but grey. Using Twitter to get closer to people is a great idea, but have some common sense. Eat your lunch; don't twitter it!