This is for the LMS Canvas, that I heard about at PETE&C, as a solution that works well on iOS devices. More details can be found on their website http://www.instructure.com/
Funny (fictional) Tweets by historical figures - summery of the person's contributions in 140 characters. Some of the Tweets are not kid friendly, so read in advance. Check ReadWriteThink to find the lesson plan for students to write their own historical text messages.