Twitter says it will not charge companies to use commercial accounts on its site.
In an interview with Marketing magazine, founder Biz Stone suggested the company might start charging business users.
But the company blog said yesterday he was simply "thinking out loud".
The company says it hopes to begin "iterating on revenue products this year," but insists it will not start charging anyone for its services.
It said, "It is important to note that whatever we come up with, Twitter will remain free to use by everyone - individuals, companies, celebrities, etc. What we are thinking about is adding value in places where we are already seeing traction, not imposing fees on existing services."
Twitter added it is early on in the ideas stage for making more money from the site. "We do not have anything to share just yet", it said.