Yes, it is safe to use FWIW by children and teens on the Internet. It is not slang or offence with some underlying meanings just a polite shortcut of For What It Worth. Its usage can assist young individuals in their views in an honorable way and promote responsible digital citizenship. Parents can consider that FWIW is a beneficial means of communication that teaches people empathy and open-mindedness. It is an excellent demonstration of how online slang can even teach one to be polite and considerate in the online realm. Know more about fwiw meaning