I think the train of thought is that you can't always guarantee that you will not want to write anything contentious, or that something you have written might not come back to bite you on the rear end one day. Some people will say that this is being a little over reactive and paranoid, but SLT of some schools do trawl through these threads and some schools also have it written into your contract/school handbook that you shouldn't use social media in certain ways. There are also some more 'risque' threads such as 'personal' and 'workplace dliemmas' which have more edgy conversations and opinions. You can't guarantee that, at some point you want to contribute to these but can't It's always best to play safe. It is possible to change your name. I'm still waiting for 'Jaye' to confirm whether or not this is a name he is known by.