Nowadays,many teachers like to use blog or other social network to communicate with their own studengts.I also pay close attention to my teacher's micro-blog.
Every coin has two sides.On the one hand,teachers have more common topics to talk about with each other.We like teacher closely in this way and it can stimulate our interest in studying.For example,teachers can post the knowledge said in the class in the daytime to the blog and students can see them at the same time ask teachers some questions or put forward some suggestions directly.It's very convenient and gives more chance to some shy students.Thus,teachesrs can improve their teaching skills and make closer relationships with students.
On the other hand, people are easily addicted to Internet. Spending too much time on it usually affects the effiency of studying and teaching.That is to say,students may only have interest in  teachers' blog rather than the most important time in the school.
On the whole, making use of the social network appropriately is a fashionable and popular method at this time.