Some video clips are posted by paedophiles and lots of are innocently posted by youngsters.Many of the comments are reported for being sexually explicit, while some reportedly inspire youngsters publishing the movies to execute sexual acts.YouTube has pledged to start using an "more aggressive stance" against the predatory behaviour from paedophiles reportedly evading protection mechanisms.Although the NSPCC say it's not adequate.Andy Burrows, associate head of kid security on-line at NSPCC,…