Twitter's Periscope is introducing a new feature that gives broadcasters the ability to make sketches and doodles during a live video stream.

According to The Next Web, Periscope is testing a new feature called Sketching that will allow users to paint in an array of colors to highlight certain parts of a shot.

The feature includes a number of colors a user can choose from, including an eyedropper tool to select a particular color of a filming object. Sketching will also allow users to add writings or short messages to point out from the screen key areas that viewers should pay attention to, as it can be useful for broadcasters when they eyewitness an event.

Periscope's Sketching is a similar tool to Snapchat's doodling feature, which shows that Twitter is keeping an eye out to the success of other platforms in a way to make live video compelling.

The new feature is being tested by a number of users for broadcasting purposes, it could mean that viewers wouldn't be able to make sketching of their own, at least for now, but Twitter has confirmed that Sketching will soon be available as a version for everyone of Periscope.

Twitter told TechRadar, "We're testing Sketching with a small group of people. This feature makes it fun and easy for broadcasters to draw on the screen while broadcasting. Coming in a few weeks for everyone."

From last year, when live video formats was introduced such as Periscope and Snapchat, live-streaming gradually became a new phenomenon for social networking. Since then, Facebook became heavily involved in live video when they introduced a tab in its mobile app.

At the same time, the rapid success and the ever-changing formats are causing competitors to indulge in each other's potential features. This includes Facebook adopting to Periscope's heart reaction, comment system and the mapping of live broadcast.