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 actress appeared in BBC shows Millie Inbetween and Almost Never.
A boy is arrested on suspicion of supplying drugs in connection with the death of Carson Price, 13.