Because I work with 6 year old students, the lessons on digital citizenship are going to look very different from high school and middle school lessons that are needed.. At this age setting the foundation of care with technology are the skills these students would need to have so when they do get to the upper grades these things will already have been taught. It would be totally inappropriate for a 1st grader to have any social media accounts and any researching that would take place would be under direct supervision of a teacher due to the content/curriculum and their inability to read such information.
I would focus on ways to be a Kind, Respectful, Responsible and Safe digital citizen. A Kind lesson would include: how to plug in/out headphones/chargers, handle equipment gently, and to tidy up when finished. A Respectful lesson would include: staying on task so that you and your neighbor can complete your best work, raise a quiet hand if you need help. A Responsible lesson would include: getting right to work, following the teacher's directions and signing in/out of programs correctly. A Safe lesson would include: keep your hands clean and out o your mouth, not touching any power cords, and not going to any websites your teacher did not approve.
Being Kind, Respectful, Responsible and Safe is a school wide philosophy that my students practice everyday so they internalize its components and have ownership over what it looks like and sounds like. Students recite a pledge and earn certificates and prizes based on their ability to demonstrate these skills so it's very personal most take it seriously. Due to these reasons it's very easy for it to carry over in other areas and be applied to digital citizenship.