The following PDF, “A Parents’ Guide to Facebook”, may be worth a read in terms of helping to safeguard our students.
I recommend taking some time to read through it: http://www.connectsafely.org/pdfs/fbparents.pdf
The following presentation is geared towards the military, but the premise is still highly valid for both students and teachers. With so many students utilizing smartphones and applications with geo-tagging and GPS, security and privacy are critical concerns that every family should fully understand.
Please take a moment to browse the presentation. Your phone may be transmitting information without you even aware of what data is being gathered! (I know, it sounds 1984-ish)