This 30 day Twitter challenge would be great to get high school students posting every day. There are examples within the post on how the challenge has been implemented before. There are fun and engaging posts for each day and it allows students to apply some of the challenges to their place of work.
A social media cheat sheet for bloggers and entrepreneurs so you know what to post and when, plus tools to help you automate everything from scheduling, to growth and engagement, and creating images. Click through to see all the tips!
How to Create Perfect Social Media Posts: Infographic