Common Sense Media– has a curriculum K-12 on Digital Citizenship.
DigCitUtah– Their resources page will provide much information. Note how they separate Media Literacy. Remember Media Literacy encompasses all: digital citizenship, information literacy, digital literacy, news literacy and more!
digitalcitizenship.net– Break down digital citizenship into nine elements on this page.
TeachingInCtrl- They offer free lesson plans.
ISTE-They really break the nine elements into a detailed pdf