If you no longer want to participate in all the fun, follow these steps to cancel your account:
Hover your mouse over the 'Account' drop down on the top Nav bar and click 'Settings'
Under the 'General'' tab, scroll to the “Cancel Account” section bottom of the page. Tagged users- click the “You may cancel your Tagged account at any time” link. Hi5 users- click the “You may cancel your hi5 account at any time” link

Select "Yes, I want to cancel my account" at the bottom of the page
Enter your password to confirm your choice
Click the "Cancel Account" button to finish canceling your account

Note: When you cancel your account, you permanently lose your entire profile, your photos, your tags and all your friends. Your login and password will no longer work on the site. If you are a VIP Member and wish to cancel your account, you MUST first cancel your VIP account to prevent further billing cycles from occurring.