How do I merge two Facebook accounts

Carole, Yes, some one else could log into there account, if your account is logged out. Check the attached links,instruction and guides, Good luck
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How do use my facebook account on someone elses tablet Face
How can access my Facebook account using someone else comput
Help Center

you may be able to get back into your Facebook account by answering a security question, using an alternate email address listed on your account or getting help from friends. Keep in mind that you'll only see these options if you set them up.To see if you have these options:

1. Go to the Facebook login page and click Forgot your password? or Can't login? in the top right.
2. Fill out the form to identify your account.
3. Select I forgot my password on the next page if prompted.
4. Look at the list of email addresses listed on your account. If you don't have access to any of these, click No longer have access to these?
5. Follow the instructions provided to answer your security question or get help from friends, if you see these options, or contact your email service provider.

Once you get back into your account you can change your login email address at any time from your account settings. You can also log into Facebook with any email address you've added to your account.

Probably because u have no friends

You should be able to just have an Amazon account?
If you have to use Google play store for amazon app, that doesn't mean you have to also have a G+ account, and you definitely don't need a facebook account

Hope this Helps?

first logout from your facebook account than you will see the sign in button on the screen press that .

Simply sign in to your Facebook account on the new kindle Facebook app, all friends will be transferred!

Based on what you described, I believe this article might be able to help you:
Multiple Facebook Accounts on iOS

You just need to install the facebook app and sign in with your same account information that you use on the PC.

I have never tried this but if I understand you correctly, you have two Kindle that have been registered to two different email accounts. This should be an easy task to merge the two to one account.

1. Decide which account is the "Master account" , let's say your Kindle will be the Master account. In this case you will leave your Kindle "as is" and get your husbands Kindle
2. With you Husband's Kindle in hand you will pull down the upper status bar, select More + and My Account
3. Choose Deregister, wait, this can take up to one hour.
4. Reboot the Kindle
5. When the Kindle is back online, go back to More + and My Account. Click on Register. This time you will resister this Kindle to the same account as your Kindle.
6. When done the Kindles will be sharing the same account.