Don't delete harmful communications (emails, chat logs, posts etc). These may help provide vital information about the identity of the person behind these.
If you feel any immediate physical danger of bodily harm, call your local police. Avoid getting into huge arguments online during chat or discussions with other users.
Tips for Children : Do not give out identifying information such as Name, Home address, School Name or Telephone Number in a chat room. Do not send your photograph to anyone on the Net without first checking with your parents or guardians. Do not respond to messages or bulletin board items that are suggestive, obscene, belligerent or threatening. Never arrange a face-to-face meeting without telling parents or guardians. Remember that people online may not be who they seem to be.
Tips for Parents : Use content filtering softwares on your PC to protect children from pornography, gambling, hate speech, drugs and alcohol. There is also software to establish time controls for individual users (for example blocking usage after a particular time at night) and log surfing activities allowing parents to see which site the child has visited. Use this software to keep track of the activities of your children.
Suggestions for better security: Use strong passwords. Choose passwords that are difficult or impossible to guess. Give different passwords to all other accounts. Make regular back-up of critical data. Back-up must be made atleast once in each day. Larger organizations should perform a full back-up weekly and incremental back-up every day. Atleast once in a month the back-up media should be verified.