Hannah Smith, from Lutterworth, Leicestershire, was found dead on Friday after being sent abusive messages on controversial website Ask.fm.
After a barrage of abuse Hannah posted the handwritten message: 'You think you want to die but in reality you just want to be saved' on the day before she died.
Her devastated parents posted the terrible news online and attacked the social media site for not doing more to tackle bullies and called for it to be banned.
Hannah's father Dave Smith wrote on Facebook: 'On Friday morning my daughter was found hanged last night i seen her ask fm account and someone had been telling her to die'.
The heartbroken father, who owns a cleaning services company, continued: 'My heart is broken in 2 and is gonna take along time to repair i just hope that none of you have to go through the pain im goin through rite now and love u all.
'Wats left after hannah took here own life.
'Me and jo sleep down stairs now - we dont have a bed time.
'We have to go for walks regular as we cant bear being in this empty house.'
It came as the debate over cyber-bullying continues to rage as several high-profile women, including MPs, have been threatened with rape and murder by trolls.
Ask fm user Chloe India posted on the website: 'R.I.P. Hannah Smith, she killed herself due to ask.fm and bullying. The haters need to realize.
'These situations need handling fast, too many people commit suicide because of the haters / cyber bully's on here and any other social networking sites'.
Posting: Hannah put this photo online on Thursday, the day before she killed herself
Devastated: Hannah Smith's father Dave Smith wants the website Ask.fm banned and is urging other parents not to allow their children to use it