Stay Safe With Twitter by Using this tools
HOW THESE SECURITY FUNCTION AT TWITTER WORKS:
Update your privacy settings and use the BLOCK function to stop a user from following you, tagging you in photos or accessing your tweets. Any @replies or mentions from a blocked user will not appear in your mentions tab ( although these tweets may still appear in search )
Twitter proviced another user control that enables you to unfollow accounts your don't want to see. Finally you can BLOCK or REPORT the user.
You also can hide a users tweets from your timeline without blocking them by using the new mute function. A red mute icon on twitter will appear on their profile visible only to you until you unmute them again.
Its Now been easier to report a user to twitter. simply click on the in-Tweet reporting button on fill out the online forms.
May this helps