Padlet - https://padlet.com/
Padlet is like paper for your screen. Start with an empty page and then put whatever you like on it. Upload a video, record an interview, snap a selfie, write your own text posts or upload some documents, and watch your padlet come to life. Once others add to it, the page will update in real-time.
Padlet is a place where you can create single or multiple walls that are able to house all the posts you want to share. From videos and images to documents and audio, it is literally a blank slate. It's collaborative, too, allowing you to involve students, other teachers, and even parents and guardians.
Who you share that with is up to you as a moderator. It can be public, open to all, or you can place a password on the wall. You can only allow invited members to use the wall, which is the ideal setup for education. Share the link and anyone invited can enter easily.
Once up and running, it's possible to post an update with your identity, or anonymously. Start off by creating an account on Padlet, or via the iOS or Android app. Then you can make your first board share using a link or QR code, to name just two of the many sharing options.
Description Source
This digital notice board is able to feature images, links, videos, and documents, all collated on a "wall" that can be made public or private. This means that not only can teachers post on the wall but so too can students.
Since the interactive space is easy to use and easily accessible from nearly any web browser-capable device, it's a great resource for teachers and students.