This week, there’s been a flurry of news about Twitter’s business plans. Okay, so Twitter’s business plans have been the subject of news for months, but this time it looked like Twitter was about to come out with a revenue model: charging businesses for certain add-on services.

Some people took this to mean that they would charge big brands for using the service in the first place, a claim that Twitter co-founder Biz Stone takes to task on the Twitter Blog. So, just to be clear, even though we reported this correctly earlier this week, I’m going to say it again:

Twitter is not going to charge anyone to tweet

Its basic service has always been and will always be free, as Stone asserts:

The co-founder of Twitter Biz Stone has confirmed that Twitter plans to charge businesses for extra services. There are few details or dates. But that’s the question in all of our minds—especially the investors who put $20 million into Twitter and I assume want to see a return.

No doubt Twitter has proven its value—TechCrunch wrote that Dell made a million over the holidays by using Twitter to tell people about discounts and sales.

There are said to be anywhere from 4 million to 6 million people using Twitter (LinkedIn.com is said to have over 20 million users and turn a profit). The problem with monetizing social networks is that people don’t go there to buy, but to communicate. Plus, they’re used to getting everything free. Even Dell’s VP was quoted as saying that Twitter better keep it simple and inexpensive if they do plan to charge.