Over time, Facebook could make the Oculus speech recognition technology work offline, Philip said. The company also may eventually support languages other than English.

Beyond that, Facebook employees weren't specific about exactly where the company is headed.

At a high level, said Deng, "we want to build a deep semantic understanding of people's interests, and also of content."

It's possible to guess about what could come next if you think about where Facebook excels. The company has data about your interests, your friends' interests and their friends' interests. It has users' pictures, videos and text posts, along with articles and other content that people have shared on the social network over the years.

"Other voice assistants may be geared toward what they have data for," Deng said.

Today, Facebook is all about community. That's another good guideline to consider when you imagine what sorts of voice-activated experiences Facebook might decide are worth pursuing.

"The stuff we would attempt to do has to be lined up with the mission and also the data that we have here," Deng said.

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Inside Facebook's speech recognition factory - CNBC