Twitter is a great way to communicate with people. People create their own Twitters and post things about their day, jobs, life, etc. You can also blog on other people's Twitters in response to the things they have said. This is an easy way to communicate with others. Twitter is definitely an effective tool for teachers. You can communicate homework, announcements, field trips, and so much more to your students and their parents. It is also a way to share classroom ideas and helpful websites with other teachers. I found some teachers Twitters and they had posted really encouraging and helpful comments. I am definitely considering having a Twitter when I am a teacher. As a kindergarten teacher, it will be very helpful in communicating things with the parents of my students.
Twitter is a free tool and it is very easy to understand. Anyone can Twitter! You can only comment on someone else's Twitter if you yourself have a Twitter. This is the only limitation I was able to find. You are able to see people's Twitters when you click on them.
The only downfall about this tool is that it would be hard to use it with your early childhood students. It is a great thing for high school students but the young children may have a hard time typing comments. In order for the younger students to Twitter we, as the teachers, would have to type out the things they want to say. This is only a small challenge that could be avoided by you being willing to help your students create and update their Twitters.
I reviewed the two sites I found on Twitter. They are both very informative on the many things Twitter can be used for. One site discussed the uses of Twitter overall and the other discusses the many uses of Twitter in the classroom. Both sites are very helpful and show how great a technology tool Twitter truly is.

Great website talking about how to use Twitter with your students!

Twitter is an easy way to communicate with friends, co-workers, and other people. For us, as teachers, it is a great way to communicate with parents what is happening in the classroom!