One video described in the report featured a girl aged about seven who was heavily made up and dressed in underwear exposing herself.
The girl says: "Mum might see it and get worried and you know, like, delete my account." Another video of "extremely sexually explicit" acts featured a girl aged about 12.
Online safety group the Internet Watch Foundation (IWF) and Microsoft, the technology giant, which worked together on the new research, said they identified nearly 4,000 images and videos in a snapshot covering three months last autumn.
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In another video described in the research a girl aged about 10 is "crying and clearly extremely distressed" as she repeatedly shakes her head at an unknown individual communicating with her over the internet, before she strips naked.
"Comments made in relation to this video on the site on which it had been posted say this video is an example of a 'sextortion' video, whereby a child is blackmailed on the basis of sexual content they have shared with the blackmailer," said the report.
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"In some instances it was clear that the children depicted were aware and intended that the content they were creating should appear on public internet sites," said the report.