I have been using Edmodo for quite some time. In fact, I just wrote about a way that your students can cast their votes in next week's Presidential Election. Edmodo just recently received a face-lift and has added some really unique features.
For example, you now have the ability to Schedule a Post. In the past, whenever you made a post, you couldn't hide it from students. It automatically appeared. With the new update, you simple have to type your message and click on "Schedule." Edmodo will allow you to choose a date and time (by the hour) to send your message.
In the teacher view, there is a window available to see recent student activity. You can see which students logged on and when. You can even see what they were up to.
I also like the updated student planner. In the past, by default you had a monthly view calendar. Edmodo has made some changes so that you can filter dates and assignments by the week. I really like this update because it is not as crowded.