The school has recently been dealing with a number of issues arising from social networking sites, including Facebook.  First of all, can I please remind you to follow age restrictions which apply to the various sites.  Secondly, if you do use such sites, please make sure that you set your privacy settings correctly to stop unwanted approaches to your account. It is extremely important that you operate as safely as possible at all times. 
 
Thank you.
Mr Currie