Social networking site Ask.fm has unveiled changes to make its site safer after recent online bullying cases. It said it would view all reports within 24 hours, make the report button more visible, and include bullying and harassment as a category for a report...The UK Safer Internet Centre, which promotes the safe use of technology, said it was "delighted" by Ask.fm's proposed changes, and added the increased visibility of the "anonymous opt-out option" was an important development.