How I Use It
I would create a teacher profile to post pictures and updates of what goes on in the classroom on a regular basis along with any important announcements. Parents could then follow the account. I would make it a private account so parents would not need to worry about that aspect of privacy and their kids.
I like Instagram for personal use and use it every day so I think it would be easy to implement into the classroom. It is very user-friendly and provides engagement for both students and teachers.