The Facebook Dilemma

In a First Person article, high school English teacher Alyssa Trzeszkowski-Giese says that creating her own Facebook page has enabled her to stay connected with students and to see some of them in a new light. By the same token, she believes her Facebook page may help students get to know her as more than a "stock character."

What's your view? Can creating a presence on social networking services like Facebook help teachers forge more constructive relationships with students? Is it wise for teachers to become online "friends" with students? What limits should be set?