Starting next month, the more than 400 million Facebook users could begin seeing a new kind of status update flow through their news feed: the current locations of their friends.

Facebook plans to take the wraps off a new location-based feature in late April at f8, the company’s yearly developer conference, according to several people briefed on the project, who spoke on condition of anonymity because they were not authorized to discuss unannounced services.

In preparation for the introduction, Facebook updated its privacy policy last November. The new policy states: “When you share your location with others or add a location to something you post, we treat that like any other content you post.”

At that time, the company also offered some foreshadowing of the new feature: “If we offer a service that supports this type of location sharing we will present you with an opt-in choice of whether you want to participate.”

Facebook has been working on a location-based tool for close to a year, but decided to wait until the product was completely ready for mainstream adoption before announcing it, said the people with knowledge of the project.

Meredith Chin, a Facebook spokeswoman, said Tuesday that the company wasn’t ready to discuss any possible location-based features. “We’re constantly experimenting with new things around here, but we don’t have any details to share right now,” she said in an e-mail message.

The new location feature will have two aspects, according to the people familiar with Facebook’s plans. One will be a service offered directly by Facebook that will allow users to share their location information with friends.

The other will be a set of software tools, known as A.P.I.’s, that outside developers can use to offer their own location-based services to Facebook users.

In the past, the company has relied heavily on its strong developer community to create innovative content around new tools and features. This community has also been instrumental in spreading Facebook Connect, which allows smaller Web sites to give their customers the option of signing in using Facebook and tapping their existing social networks.

Of Facebook’s more than 400 million users, about 50 percent log in to the site at least once a day, and 100 million people access the service from mobile devices. That makes the location feature an area of strong focus for the company.

The staggering number of users on the site has also brought a heightened level of internal scrutiny to the project, according to the people familiar with it. Facebook has been trying to figure out how to add location data to its service without raising potential privacy concerns or negative feedback from its users, as it has in the past with new features and redesigns.

One of the people familiar with the project said that the company was not trying to beat the smaller location-based social networks, such as Loopt, Foursquare and Gowalla.

Instead, Facebook wants to go head-to-head with Google in the fight for small-business advertising. Facebook redesigned its business pages last year, with the hope of offering more features for small-business owners. According to Facebook, the Web site currently hosts more than 1.5 million local businesses from around the world.

In 2009, Google started Google Latitude with the pitch to let users “See where your friends are right now.”

Twitter, another Facebook competitor, has also added an option to include location data with messages