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He also cited Japan and Taiwan as countries where “we could have been more successful with a little bit more effort.”     But Acton otherwise struck an upbeat tone in his first public comments since Facebook said earlier this year it would acquire fast-growing WhatsApp for $19 billion in cash and stock. Acton noted what he saw as WhatsApp’s value, saying he believed it would send 1 billion new users to the social network, even as WhatsApp services remain apart from Facebook’s.     He described the relationship between the two companies as “separate but equal,” saying co-mingling the services could create “risk and peril.”           “We don’t look at it from the experience of, ‘We’re going to get swallowed by the Borg,’” he said, referring to a group in the show “Star Trek” who assimilate other species.     Downplaying concerns that Facebook could learn data about WhatsApp users, Acton said WhatsApp had little valuable information to share.     “We don’t have much beyond a phone number to work with,” he said, adding the companys staff didnt trawl through user messages.