Following the success of the promoted tweets revenue model, Twitter is going a step further: They're rolling out the same model onto the iOS and Android version of the platform.

The promoted tweets feature--which locks a specific tweet to the top of people's feeds--is already available on the mobile website (mobile.twitter.com). The feature will be rolled out in an update to iPhones and Android-based phones over the next few weeks.

It has been nearly two years since we introduced Promoted Tweets, the first in our suite of Promoted Products, Twitter said in a statement. In that time, people around the world have increasingly accessed Twitter from a mobile device. Today, we are taking an important next step in making our Promoted Products available to those users.