The world's first bullying alert system for Facebook, which scans text and flags up abusive behaviour has been devised by a UK father.

The father-of-four came up with the idea after reading a string of cyber-bullying horror stories.
The 48-year-old said he hoped his system - called 'Know Diss' - would keep children safe from online bullies.
"Know Diss is a very simple concept. It is also a partnership between parent and child because one cannot sign up without the other," he said.
Clarke, a consultant at Gloucestershire Royal Hospital in Gloucester, joined forces with friend Alan Saul to design and implement 'Know Diss', which costs 12 pounds for a yearly subscription.
Together they trawled through sites such as Urban Dictionary and watched the television series 'Skins' to build their comprehensive database of insults.
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It uses a database of several thousands of words to identify bullying trigger words in a number of spelling variations.
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When a bullying phrase is detected, it is copied and immediately emailed to the child's parent or 'Facebook guardian' who can decide whether further action is needed.
An example of a 'bullying' phrase which would be picked up by the system is: 'Go slash your wrists, fat boy' or words such as 'gay boy'.
When triggered, Know Diss automatically sends an email to the parent which reads: "The following text has been picked up on your child's Facebook account. Go and have a look at it."
Source-ANI