You might have to log in.You can flag them or their profile as obscene/inappropriate or report them to Facebook.
Go the the account tab in the upper-right hand corner, select account settings, and select deactivate account.
You can reactivate your Facebook account by just logging in as normal with the email and password you registered with, for up to 30 days after deactivating. They know that some people deactivate their account out of haste or anger and then regret it later. Unlike MySpace, you don't loose anything.
You activate a cancelled account on Facebook by logging into the Facebook account with the previous details.
You can deactivate your account which is bacsicly the same as deleting it. Your account will never be known as ever being made, and if you ever want you can reactivate it. If you want to completely remove your account you will have to email facebook a request.
If your talking about deleting your account, then you go on Facebook, click the ' Account' button, and there should be a list, click 'Account Settings' and right at the bottom should say deactivate account. Click the icon on the right with says' deactivate', then fill in the bits, and then a little box will pop up saying enter password, enter your password and it shall be gone. If your talking about logging out, then, click the 'Account' button, and at the bottom it will say Log Out.
By logging in and removing it manually.
by logging on to www.facebook.com/ and logging in or creatinga an account. It's all on the home page.
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An easy way to delete a VK account is by logging in the account, and then clicking on this link http://vk.com/settings?act=deactivate
Change your password
Change your passwords.
There is a handy tool for searching on Facebook without account or logging in. The site listed below allows to search on Facebook by keywords and shows relevant facebook pages as well as recent posts of people on facebook with such keywords.