Jonah Goldberg linked to this analysis of tweets from @realDonaldTrump on the site Variance Explained, in the Various & Sundry section of Friday's Goldberg File,

The analysis notes that tweets come both from an Android platform and from an iPhone.  Each source tends to consistently have its own peak time of the day for tweets.  The language of the tweets differs by where they were posted from, and the tweets from an iPhone are far more likely to include links to images and hashtags.  The tweets from Android are usually far more angry in tone.