Macquarie Capital analyst Ben Schachter suggested in a research note that Apple Inc. (AAPL) Google (GOOG), Microsoft (MSFT) or Amazon.com  (AMZN) could just have easily purchased Oculus.

"As for the price tag, as with WhatsApp, there is no near-term financial model that will drive the $2 billion valuation," Schachter wrote. "The price was $2 billion because that is how much Oculus VR needed to sell, and it was likely some number above what other entities were willing to pay."

Facebook's track record with photo-sharing site Instagram, which the company acquired for $1 billion in 2012, gives the company some credibility with bold, top-dollar acquisitions.

"Instagram has been a successful acquisition in our in our view, given rapid user growth, high mobile engagement and strong monetization potential," Cowen & Co. analyst John Blackledge wrote in a report.

Instagram has grown its customer base from 22 million users at the time of the acquisition to 200 million, Blackledge observed. It could be the second-largest social network by the end of the year.

While Oculus isn't ready to ship a consumer version of its headsets, Zuckerberg told investors that the product is nearly ready.

"I mean, the quality of their product, even their development kit...they probably could ship it as a consumer thing if they wanted because it's so high quality," he said.

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