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Twitter co-founder Evan Williams on Friday said he had been told that the microblogging service has been partially blocked by China but had no confirmation.
"That's what I've been told," he told AFP, when asked about reports of the China block on the new Internet phenomenon.
"I have heard reports on that," he added on the sidelines of the World Economic Forum in Davos, but said the company did not have direct confirmation.
Williams said China can use a firewall to block the microblogging service used by millions around the world -- but that Twitter was not "actively" looking for ways to get around any block.
"There are ways for users to get around it, but I'm not an expert on that."
When asked about media reports that Twitter was developing ways to get around the firewall, Williams said he had been "misquoted."
"We're not actively developing any way to get around it," he said, although he stressed that "we're for the free exchange of information."
Asked if his company had noticed cyber attacks, such as those launched against search engine giant Google from China, he said no such moves had been detected.
Google had threatened to pull out of China over the attacks as well as over censorship in China which it opposed.
Google's chairman and chief executive Eric Schmidt stressed during a Davos panel session that it "does not then follow that we want to not be in China."
"We would very much like to stay in China, we would very much like the censorship which we oppose to not be in China," he stressed.
"What we don't like is the censorship. What we hope is that that will change."
