There's no doubt that mobile is a huge space for social media. Over the past several years, Internet usage has largely moved from the web to smartphones and tablets, increasing the need for social networks to adapt to mobile.
Twitter and Facebook have catered to users by creating more intuitive user interfaces, both with apps and mobile web. However, according to Nielsen's new U.S. Digital Consumer Report, 85% of Twitter usage occurs on mobile devices, as opposed to 57% of Facebook usage. This shows that it's even more important for Twitter to deliver a compelling mobile experience.
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Created by Statista, the following chart shows how users are using the two social media sites, and for how long. Even though Facebook users spend more time on the platform, Twitter's smartphone app is getting more mileage in the long run.

Image: Statista
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