Image copyright Twitter Image caption Viewers can watch Wimbledon and post tweets about the action on the same screen
Select tennis matches at Wimbledon are being live-streamed on Twitter.
It marks the first time the tech firm has broadcast footage from a sports event in this way.
The high definition-quality stream is being offered in partnership with the TV network ESPN and the organisers of the Championships.
Several of Silicon Valley's leading tech firms are investing in live-streaming technologies.
Twitter bought Periscope in January 2015, before the app had formally launched.