This question already has an answer here:
As a teacher and a teacher manager, I noticed that the students frequently ask teachers for their facebook names or send them friend requests.
I think that students having their teachers' personal lifes on the facebook feed leads to situations inside the classroom that compromises the way students see the teacher.
How should I respond to a situation where teachers actually accept the friend requests?
Thanks to @JoBedard statement about the "age factor":
It depends on the age class of people your teaching.
We considered useful to specify that the students are age 13 to 20 years old. I would like to add that they are 90% women and from the south-american society, which has different behaviors and educational principles.