Thanks to John Schu (@MrSchuReads on Twitter), I have discovered the joys of Padlet. There are a zillion ways to use this, and I am looking forward to having kids share their ideas here. It's incredibly easy to create a wall and share a link so that kids can jump on and start collaborating. For starters, I think I want to create a wall for each class that comes for book checkout and ask each kid to share the title and author of one book they are reading. I got this far in about 15 minutes on two different desktops in my house and my phone.
It's free to sign up for Padlet; all you need is an email address. Once you have an account, you can create multiple walls and share the address for each wall with anyone you want to have access. You can set the security for any given wall at several different levels, from completely private by-email-invite-only to public and Google-searchable. There are also different administrative settings for who can view the wall and who can post to it. To post, users can type or paste text and add files, photos, or links to their posts. Lots of possibilities here; looking forward to finding ways to use it...