Building a phone, he said, "wouldn't really make much sense for us to do."

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Zuckerberg also said, however, that the company is looking to make the mobile Facebook experience more complete, and that he wants to "support a development ecosystem, where other apps can build on top of Facebook."

The Facebook CEO's precise phrasing led to argue that Zuckerberg's non-denial could be purposefully misleading, given the fact that he used the word "build."

"His comments still leave tons of room for the company to be doing most of the work on a phone, while working alongside one or many partner manufacturers to do the actual hardware. Even could arguably say it doesn't manufacture phones -- Foxconn builds the phones -- and Apple is the most profitable phone maker in the world," he wrote.