A dozen named groups and individuals will be purged from the social network, it said.
Holly Eastall says she felt suicidal after being falsely accused of abuse following her baby's death.
Former beauty queen Sophie Gradon was found dead by her boyfriend who killed himself days later.
The home secretary speaks out as hundreds of Extinction Rebellion protesters are arrested in London.
Milly and Toby Savill were on Santorini when the buggy they were in fell into a ravine.