I found a quite useful and interesting website for teachers Free Technology for Teachers.
HOW CAN YOU BE A SUCCESSFUL TEACHING IN 21st CENTURY?
The answer is: USING TECHNOLOGY!
So where to find the proper technology tools for teachers? Online!
It is different from decades ago, teachers spent plenty of time cutting cards, writing on blackboard, carry radio devices from one classroom to another classroom. Now we only need computer with connecting with Internet. You can find thousands of pictures you want, you can download hundreds of video clips relates to your textbook. Even you could use vivid cartoon images on your demonstration to get students' attention, involve in your activity. All of these things make teachers' lesson more attractive and easier than before.
In this website, teachers share valuable technical tools including videos, apps, and so forth. You can embrace everything you want, and they're totally free. Of course, if you have some useful tools that never recommended by other teachers, or you have some genius ideas about using technology in classroom, please be generous to offer. That's how the website was built, that's how we improving education in 21st century, that's how we become a successful teacher.

All knowledge resides in humanity

Maybe about three years ago when I first heard Twitter I registered an account, but I have no friend use that, also I don’t know how to follow the person that I’m interested. At that time, I thought Twitter is only used for friends who knows each other. After one year, Chinese network censership walled Twitter, until now it is not allowed to use in mainland of China, because Twitter is a free place to contribute any idea, and Chinese government regard this a danger to them. So I ended up with my Twitter life, now I only have couple of native American friends use that, however I’m still not that used to log in. When I was reading the article "Can we use Twitter for educational activities?” I feel that it was such a pity that I would not use Twitter very well, since it is such a great tool for people to communicate very directly and immediately.

Though I’m not a teacher now, on one hand, I have academic and practical teaching knowledge to share with people; on the other hand, many quite experienced language teacher contribute their ideas, teaching videos and bunch of valuable resources on Twitter, I learned a lot from them.  Exactly as Free Technology for Teachers: Twitter - Expanding our Classroom

the words say: “No one knows everything, everyone knows something, all knowledge resides in humanity” It is the magic of social network, and Twitter plays a crucial role in today’s world.

Let teachers play Twitter magic!