““In 2009, the Twitter homepage attempted to boost motivation. But by 2012, Twitter had discovered that no matter how much users knew about the service, driving them to open an account and start following people resulted in much higher engagement. Recently, Twitter’s homepage has been modified slightly to encourage downloading of the company’s mobile apps (figure 17). The simplicity of the large sign-in or sign-up triggers on the 2012 version remain, but Twitter now knows that driving users to install the app on their phones leads to the highest rates of repeat engagement.””