MySpace is owned by Rupert Murdoch, the media mogul. It enables people to set up free miniblogs which they can connect to other users.
Emily, a 24-year-old teacher in a Welsh high school, overheard pupils discussing a colleague's Myspace profile and lewd messages they had found on it.
To look for herself she only needed his first and last names. "It is very basic information which any pupil could have, and allowed me to find his account with ease," she said. "All his messages were in full view for anyone to see even though you can select to only have your profile seen by friends".
A MySpace user herself, Emily has seen many younger teachers joining the craze.
"MySpace is like what mobiles were 10 years ago. It's definitely a growing trend," she said.
But she believes the only safe way is for teachers not to give their real names.
"It's a shame teachers have to use an alternative identity online because of their job but it comes with the territory," she said. "Do you really want pre-pubescent kids reading intimate messages between friends? We shouldn't have to hide but we have to. No one wants a misconduct case on their hands."