If you see a little box with symbols inside in a message or reply, it means the person used what is called an emoji program. It also can mean that you do not have the correct font installed on your system.
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A person can search multiple emails on Facebook by typing the emails into the search box. If there is an email associated with a user, it will appear in the box.
what does mean by this close-box
Simply go to the message section, type the name of your facebook friend to whom you want to send message in the 'to' box. Type the message and simply send it.
simply type in your email and click the button that says forgot your password and it will send you a new one to your email then you copy and past it to the password box on facebook then hit the button to log in
In order to use Facebook chat on an Android tablet, you should download an app for it. Messenger is the best. It's available in the Play Store, and it's free.