Twitter and Facebook usage by devices: 85% tweet from their smartphones

This chart shows how long Americans are using Facebook and Twitter on different platforms.

 The above data shows users are spending  more time on "twitter " compared to Facebook from  their mobile device through smartphone apps.American Facebook and Twitter users already 
spend more time using the services on their smartphones than they do on their  PCs  and  laptops. Nielsen data shows   85% of Americans tweet from their  smartphone

However  in terms of engagement, Facebook outranks Twitter based on the time they spent on both the sites