The site - which includes schools in other countries - lets kids mark their teachers out of five for easiness, clarity, helpfulness and popularity.

But teachers' groups in Scotland say it's outrageous that negative claims about their skills can be made on it.

Students are not allowed to comment on teachers' personal lives, appearance or claim they do anything illegal.

David Eaglesham, from the Scottish Secondary Teachers' Association said: "These claims are cheap, tawdry and malicious. This website is not benefiting pupils or parents but it will be very difficult to shut down."

The man who created the website, Michael Hussey, defended it, saying: "The website helps to identify teachers who are not connecting with their students, as well as singling out the brightest and the best teachers."

Difficult

The site was started in America, so it's very difficult for anyone in the UK to do anything about it.

More than 17,000 Scottish pupils have rated schools on the site so far.

It lets students and parents from America, Canada, the UK and Ireland rate their teachers.