A survey has found that 10% of adults in Ireland have experienced some form of online abuse.
The research, carried out by ZenithOptimedia, saw 186 children and 1,000 adults complete the survey.
A fifth of the children surveyed said they have been bullied online.
The study found that more than half of the bullying of children is taking place on Facebook; with one in ten experiencing it on Instagram.
Girls experience twice as many attacks using Snapchat as boys do.
The survey also asked children about their feelings of depression and found that of those who had experienced cyber-bullying, over a third had felt depressed.
Despite the prevalence of online bullying, just one in ten parents think that their children has been a victim.
Facebook is also the platform where most adults experience online bullying, the survey found, with one in ten falling victim on Twitter and 7% on Snapchat.
A third of online bullying of adults involves the spreading of lies and rumours, or the receipt of threatening texts or emails.
A fifth of respondents say they have had embarrassing photos of them posted online by others.
A quarter of women in Ireland say they have personally experienced body shaming online, compared to 16% of men and one in ten children.
'Unfollowing' or 'unfriending' are the most common course of action to stop cyber-harassment, the respondents say.