NEW YORK — Facebook is adding video to its popular photo-sharing app Instagram, following on the heels of Twitter’s growing video-sharing app, Vine.
Instagram cofounder Kevin Systrom said Thursday that users will record and share 15-second clips by tapping a video icon in the app. They can also apply filters to videos to add contrast, make them black and white or different hues.
‘‘This is the same Instagram we all know and love but it moves,’’ he said at an event held at Facebook’s Menlo Park, Calif., headquarters.
Vine, which launched in January, has 13 million users and lets people create and share six-second video clips. Instagram has 100 million users, up from 20 million when Facebook bought the company more than a year ago. If users like it, Facebook’s move could propel mobile video sharing into the mainstream, Systrom said.
To use the video feature, Instagram users who have downloaded the latest version can tap on the same camera icon they use to snap photos. A new video camera icon will appear on the right side. Tap it and a screen with a red video button will let you record clips of sunsets, kids running in parks, or co-workers staring at their computer screens.
The app will record for up to 15 seconds as long as the user’s finger is on the red button. Not unlike Vine, taking your finger off the button will stop the recording, allowing you to record something else. Once you have 15 seconds of footage, you can play it from the beginning and post it on Instagram to share with others.
A feature called ‘‘cinema’’ adds stabilization to the videos so they don’t look like shaky amateur shots. Systrom called it ‘‘completely mind-blowing.’’ Right now, only owners of the iPhone 4S or iPhone 5 can shoot video using this feature.
Given Vine’s popularity, ‘‘it is perhaps more surprising that Facebook has not introduced video for Instagram sooner. There is no doubt Twitter will move quickly to up the ante on Vine and this could undercut Facebook’s efforts with video on Instagram,’’ said Eden Zoller, principal consumer analyst at Ovum, a research firm.
Forrester Research analyst Nate Elliott thinks taking features from smaller rivals and offering them to a much larger set of users ‘‘has worked well for Facebook,’’ so far.
When Facebook Inc. agreed to buy Instagram in April 2012, it offered $1 billion in cash and stock. But the value of the deal fell to $715 million by the time the deal closed last August.
Instagram was the first — and only — company Facebook has bought and kept running as a separate application. Until its Instagram purchase, Facebook was known for smaller ‘‘acqui-hires,’’ a type of Silicon Valley deal in which a company purchases a start-up as a way to hire its workers and then shuts the acquired company down.
Facebook still hasn’t said how it will be able to make money from Instagram, as it has not introduced ads on the service. But online video ads are growing. Research firm eMarketer estimates that the US digital video advertising market will grow 41 percent this year, to $4.1 billion from 2.9 billion in 2012. The mobile video ad market is much smaller, though eMarketer expects it to more than double this year to $518 million.