GroupPage
Websitehttps://www.facebook.com/about/groupshttps://www.facebook.com/about/pages
Audiencesmallbig
PrivacyOpen, closed, secretOpen
VisibilitityNot indexed by search engine.
The user need to search once connected
Indexed
JoiningPermission from a group member is needed.
A member can be added by an existing member of the group (if administrator allowed it).
Anyone
MessagingYesNo
ChatYesNo
Publish as...YourselfPage
(your name does not appear)
Post goes...On the group wallOn the wall and on fans feed
RestrictionsNoYes Can choose whether fans can post on the wall
EventsYesYes
DocumentsYes Members can create and collaborate on documentsNo
CustomizationNoYes Using development tools
ApplicationsNoYes Can make the content restricted to fans (need to like the page to see the content/application)
Custom URLNo but an email for the groupYes with 25 likes
Notification for new post(s)Yes by email (default)Yes on the feed
Visitors statisticsNoYes
Link for creationhttps://www.facebook.com/about/groups then click on "create group"https://www.facebook.com/pages/create.php
RecommendationFor a teacher who wants to communicate with its students, I recommend using one or several secret facebook groups.The page being public, I recommend for all schools.

It's a simple and fast way to communicate officially with parents and students.

This tool should however be used in conjunction with a website.