Twitter's Chief Financial Officer has proven even those running the social media website, can have trouble using it.

Anthony Noto sent out a tweet he'd meant to be a private message, to another user.

US correspondent Richard Arnold told Newstalk ZB's Mike Hosking the message itself is raising eyebrows.

"He tweeted, 'I still think we should buy them, I have a plan'.

"Since then he's clammed up, refused all comment, refused to name what he was thinking about buying.

"Well, maybe the board is just limiting his computer playtime."