Today I was attracted the article about "Facebook contact with students"

Arthor described the experience that he joined current students FB friends.

It was seemingly good methods to communicate with students. But the author was regretted.

Teacher is not a friend of students. Now I have strongly agreed him.

Teacher should eveluate students. Therefore teacher should keep some distance with students.

For the objective scoring. But It seemingly very useful be friend with gradeated students as well.