Instagram is now offering comment moderation to everyone via a customizable keyword filter. Along with existing options that let users block accounts, report content or choose to have a private profile, Instagram hopes the tool will help keep Instagram a positive place and let users choose what's acceptable. Made available Monday in Instagram's settings under "Comments," the tool offers users a "hide inappropriate comments" option. If you switch it on, the app will block a pre-selected set of offensive words. Users can also customize a list of keywords they don't want to see.