It seems to be good idea, right now it cannot be judged how much or to what extent it will help to avoid such incidents but the idea is definitely worth trying. Even though it is fractionally help full it is worth to put it.
This also highlights the fact that it is very important to impart training to school goers in school itself about safety habits/tips on Internet. Apart from that it is very important that parents too go through such training where they can keep on guiding their kids for safety habits when using Internet and specially when they are on social networking web sites.
Quick Heal had done a educational initiative with similar thoughts by publishing a series of articles on Internet Safety in Educational Times (of Times of India) news paper which is distributed across all the major schools in India.
Here is the link to the series of articles by me on Internet Safety education initiative:
Times NIE articless
News about Panic Button on Facebook is here: