San Francisco, Aug. 27 -- Jack Dorsey's biggest regret is that Twitter, which he co-founded, has become a company.

In a tweet, Dorsey who is now running financial payments company Block, said: "The biggest issue and my biggest regret is that it (Twitter) became a company".

When app researcher Jane Manchun Wong asked him in what form did he wish Twitter to become, Dorsey replied: "A protocol. Def can't be owned by a state, or company. Becomes clearer every day".

He had earlier tweeted that Twitter should be an open and verifiable protocol.

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