Padlet is a platform in which you can create a 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.