Pretty much all of the classes I have had children have found out my name. If I don't tell them directly they will work it out from seeing folders/notes addressed to me/hearing other staff members calling me by my first name. It doesn't bother me that they know. In fact at one of the schools I used to work at all the staff were known by their first name as Miss Sarah or Mr Eric or whatever - even the headteacher. Definitely my preferred naming as I have a silly surname (and indeed often the children are disappointed I have a relatively normal first name to go with it - I get a lot more stick about my surname than I do about my first name!) As for facebook I have an account, people who aren't friends with me can only see a profile picture and my name. I don't want to be unsearchable as there are legitimate people that want to add me that I want to be added by. And I am easily found as I am the only person on facebook with my name and even if you put my surname in there are only about 20-30 of us! I have had requests off older students (primary) and I have just sent them a polite message back explaining that they can't be friends with me on facebook and they don't mind.