I recently started utilizing Instagram for the purpose of collecting photos and short videos pertaining to my work as a technology integration specialist. It is by no means a perfect solution, but it helps to separate my work world from my home life.
Much to my surprise, one of my teachers started following me on Instagram. The account was clearly intended to be a class account as the username had the teacher's name the word "class" after it. When I asked the teacher about using Instagram, she was looking for an easy way to send photos out to parents. Instagram certainly does the job as you have one location for all your class photos to appear.
Instagram can also be easily added to your teacher website. By visiting http://www.instagram.com/accounts/badges, you can copy an embed code to paste into an HTML enabled box on your website. My teachers utilize Blogger. Here are directions on how to place an Instagram Badge on your Blogger blog: