>> Facebook stock sinking roughly 5% Thursday, after the social media giant warned its revenue growth could slow, in what was otherwise a stellar earnings report. So is Facebook a victim of its own success? Reuters Global Tech Editor, Jonathan Weber.>> Well, I think they have a challenge of large numbers.
Which is, the company's already so big. I mean, there are only so many people in the world, so that's one issue. I think they've also bet very heavily on video advertising. That's starting to show up in the results. It's something Zuckerberg touted in his call today as a big success.
>> Facebook's third quarter profit up was over two and a half times what was a year ago driven mostly by mobile advertising. And its revenue jump over 50%, exceeding expectations. But another big challenge for Facebook, competition, especially in video which it's been betting big on.>> Certainly, that should continue to power their results.
But at the same time there are a lot of people getting into that arena. So you've got SnapChat, you've got YouTube, you've got many other entities that also see a similar opportunity.>> Facebook said there were nearly 1.8 billion people using its platform at least once a month.
Up 16% from the same period last year. And with new competitors popping up every day, Facebook will not only have to keep those users, but build on them.