Facebook CEO Mark Zuckerberg was on stage this afternoon at the TechCrunch Disrupt conference, and Michael Arrington wasted no time in getting to the big question hanging over the company right now, asking Zuckerberg about the steep decline in Facebook’s stock price since its IPO.

“The performance of the stock has obviously been disappointing,” Zuckerberg responded, but he said investors are misunderstanding the potential impact of mobile usage on Facebook in the next three to five years. In fact, he said, mobile will be “fundamentally good.”

There are more users on mobile, they’re more engaged, and more likely to be daily active users than people on desktop computers. In terms of making money from mobile usage, he said he sees mobile as more like TV, because you can’t just slap ads in a right-hand column.

“The ads have to be more integrated,” he said, calling it a “huge opportunity” but acknowledging that Facebook has had “a bunch of missteps” on that front, including betting too much, too early on HTML5 as opposed to native apps.

Facebook released revamped native version of its iOS app last month, considerably boosting the speed and improving other features. The company is also working on a native Android app.

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