GroupMe is a group text messaging communication 2oOL. It is one of the simplest app’s out there that will create a private chat room for your groups (up to 200). I could not image that many in a chat room, but it is possible. This app is suitable for adult use. Blue Valley does not allow the use of this app for students. If you are looking for a group messaging 2oOL to use with your students, I would suggest Remind.
I would suggest that you use this for small groups such as: coaching groups, PLC’s, departments, etc. You add members manually or via a link. This app works essentially with every phone that gets text. You do not have to have the app on your phone to use it. You can create and manage a calendar, send photos and videos. You can also mute notifications.
Here is the help page for more information: http://help.groupme.com/homeB