Google+

I've just read this article about Google+, but I created a profile a while ago. I think it's a good web page to use for yourself but also for your classes. It is kind of similar to Edmodo, because you can add only the people that you want - for example your students - and you can have them in a group (called a circle). For example you can create a circle called "ENGLISH - 5.A" and you have all of the students from this class there. You can also share things with them, like documents, pictures, videos and so on and you can send private messages to them. You can also have an app in your phone for Google+, GoogleDisk and Youtube.
Here is some more information about Google+, how to create a profile and use it.