"Defamatory allegations" refers to false statements or claims that harm someone's reputation by making negative and damaging claims about them. Full definition
Morleigh Homes v BBC Panorama (2016) Pre-publication Advice: BBC documentary programme with undercover footage making serious defamatory allegations about the mismanagement of care homes by the owners and mistreatment of residents by the staff. (elyplace.com)
Hudson says that, providing websites and ISPs act in a timely manner to remove of fending content when alerted, the liability for any false allegations will fall squarely on the individual: «Sites that do not routinely edit or moderate content have a degree of protection under the Defamation Act 1996 and the Electronic Commerce (EC Directive) Regulations 2002, if they did not know and had no reason to believe they were publishing defamatory allegations or private information.» (newlawjournal.co.uk)