I Have Lost My Password Of Fb & Yahoo Both.

Visit http://www.facebook.com/help/contact.php?show_form=account_compromised

Inside the contact Form You need to Fill in the Following Details Correctly.

Full name on the account:

Enter the Full Name as you have given in Your Face Book Account.

Network(s) the account belongs to:

Enter the names of the networks you have joined. Include as many as possible.

Email addresses that may be affiliated with the account:

This is the email address you used as username to login to face book.

Your contact email address:

Enter a email address you can be contacted by facebook. They will contact you regarding this issue.

URL (web address link) of the profile page:

Give the link to your facebook profile address.

Description and steps to reproduce the issue:

Provide as much as information in here regarding how your face book account was hacked etc. It is recommended to  include the time and date when you were able to access your account for the last time. These give better chances to restore the hacked facebook account.

click on the "forgot password" link just over the field where you enter the password in the facebook homepage. They will send a message to your email address. Using that mail you can reset your password.

for yahoo : 

sorry, but if you don't know the secret question you will not be able to and Yahoo will not help. I have questioned this many times thru Yahoo. Below explains everything.

You can get a new password, a Yahoo! ID reminder, or both. If you forgot your Yahoo! ID or password, go to the Sign-in Problems page. https://edit.yahoo.com/forgot?login

If you forgot your Yahoo! ID, you need to provide three pieces of information so we can confirm your identity:

* Your birthday
* Your ZIP or postal code (at the time you created your Yahoo! account or when you last updated it)
* Country code (at the time you created your Yahoo! account or when you last updated it)

Be sure to provide the same information you gave the last time you registered for a new Yahoo! ID or password or the last time you updated your account.

If you forgot your password, you can create a new one. But first you’ll have to provide the following information so we can confirm your identity:

* Your Yahoo! ID
* Alternate email address, mobile phone number, or the answers to your secret questions

A Reset Your Password link will be sent to your alternate email address. Click the link and enter your new password in the Reset your password page.

If you entered your secret question incorrectly or forgot what you originally entered, for security reasons, we cannot tell you what your Yahoo! ID is or let you create a new password.

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If you are unable to comply with the above requirements you will have to create a new I.D.