Facebook has indexed one trillion posts that have been shared on users' feeds. This will allow the in-app search engine to suggest the most shared links. This data will allow Facebook to steal a march on Google, experts warn.
This, coupled with advertising opportunities could worry Google, according to analysts, given the stiff competition for mobile ad dollars.
"If you look at Facebook's progress over the last few years, the real growth has been in its mobile advertising revenue," Jack Kent, senior mobile analyst at IHS, told CNBC by phone.
"That means that Facebook's mobile advertising growth will put pressure on Google. And anything which keeps people inside Facebook with an experience that means that you don't need Google would put pressure on Google."
Over 70 percent of Facebook's total advertising revenue comes from mobile and the company has been working hard to keep people in the app for longer.
Another attempt by Facebook to keep its users away from search engines is news. A report in the New York Times this year suggested Facebook was in talk with news publishers to host content on the social networking site rather than linking back to the publisher's website. The aim would be to share ad revenues.